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The Moon is Earth's only natural satellite. At about one-quarter the diameter of Earth (comparable to the width of Australia), it is the largest natural satellite in the Solar System relative to the size of its planet, the fifth largest satellite in the Solar System overall, and is larger than any dwarf planet. Orbiting Earth at an average distance of 384,400 km (238,900 mi), or about 30 times Earth's diameter, its gravitational influence slightly lengthens Earth's day and is the main driver of Earth's tides. The Moon is classified as a planetary-mass object and a differentiated rocky body, and lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's (0.1654 g); Jupiter's moon Io is the only satellite in the Solar System known to have a higher surface gravity and density.

The Moon's orbit around Earth has a sidereal period of 27.3 days. During each synodic period of 29.5 days, the amount of visible surface illuminated by the Sun varies from none up to 100%, resulting in lunar phases that form the basis for the months of a lunar calendar. The Moon is tidally locked to Earth, which means that the length of a full rotation of the Moon on its own axis (a lunar day) is the same as the synodic period, resulting in its same side (the near side) always facing Earth. That said, 59% of the total lunar surface can be seen from Earth through shifts in perspective due to libration.

The most widely accepted origin explanation posits that the Moon formed about 4.51 billion years ago, not long after Earth, out of the debris from a giant impact between the planet and a hypothesized Mars-sized body called Theia. It then receded to a wider orbit because of tidal interaction with the Earth. The near side of the Moon is marked by dark volcanic maria ("seas"), which fill the spaces between bright ancient crustal highlands and prominent impact craters. Most of the large impact basins and mare surfaces were in place by the end of the Imbrian period, some three billion years ago. The lunar surface is relatively non-reflective, with a reflectance just slightly brighter than that of worn asphalt. However, because it has a large angular diameter, the full moon is the brightest celestial object in the night sky. The Moon's apparent size is nearly the same as that of the Sun, allowing it to cover the Sun almost completely during a total solar eclipse.

Both the Moon's prominence in the earthly sky and its regular cycle of phases have provided cultural references and influences for human societies throughout history. Such influences can be found in language, calendar systems, art, and mythology. The first artificial object to reach the Moon was the Soviet Union's Luna 2 uncrewed spacecraft in 1959; this was followed by the first successful soft landing by Luna 9 in 1966. The only human lunar missions to date have been those of the United States' Apollo program, which landed twelve humans on the surface between 1969 and 1972. These and later uncrewed missions returned lunar rocks that have been used to develop a detailed geological understanding of the Moon's origins, internal structure, and subsequent history.

The usual English proper name for Earth's natural satellite is simply the Moon, with a capital M. The noun moon is derived from Old English mōna, which (like all its Germanic cognates) stems from Proto-Germanic *mēnōn, which in turn comes from Proto-Indo-European *mēnsis "month" (from earlier *mēnōt, genitive *mēneses) which may be related to the verb "measure" (of time).

Occasionally, the name Luna /ˈlnə/ is used in scientific writing and especially in science fiction to distinguish the Earth's moon from others, while in poetry "Luna" has been used to denote personification of the Moon. Cynthia /ˈsɪnθiə/ is another poetic name, though rare, for the Moon personified as a goddess, while Selene /səˈln/ (literally "Moon") is the Greek goddess of the Moon.

The usual English adjective pertaining to the Moon is "lunar", derived from the Latin word for the Moon, lūna. The adjective selenian /səlniən/, derived from the Greek word for the Moon, σελήνη selēnē, and used to describe the Moon as a world rather than as an object in the sky, is rare, while its cognate selenic was originally a rare synonym but now nearly always refers to the chemical element selenium. The Greek word for the Moon does however provide us with the prefix seleno-, as in selenography, the study of the physical features of the Moon, as well as the element name selenium.

The Greek goddess of the wilderness and the hunt, Artemis, equated with the Roman Diana, one of whose symbols was the Moon and who was often regarded as the goddess of the Moon, was also called Cynthia, from her legendary birthplace on Mount Cynthus. These names – Luna, Cynthia and Selene – are reflected in technical terms for lunar orbits such as apolune, pericynthion and selenocentric.

Isotope dating of lunar samples suggests the Moon formed around 50 million years after the origin of the Solar System. Historically, several formation mechanisms have been proposed, but none satisfactorily explained the features of the Earth–Moon system. A fission of the Moon from Earth's crust through centrifugal force would require too great an initial rotation rate of Earth. Gravitational capture of a pre-formed Moon depends on an unfeasibly extended atmosphere of Earth to dissipate the energy of the passing Moon. A co-formation of Earth and the Moon together in the primordial accretion disk does not explain the depletion of metals in the Moon. None of these hypotheses can account for the high angular momentum of the Earth–Moon system.

The prevailing theory is that the Earth–Moon system formed after a giant impact of a Mars-sized body (named Theia) with the proto-Earth. The impact blasted material into Earth's orbit and then the material accreted and formed the Moon just beyond the Earth's Roche limit of ~2.56 R. This theory best explains the evidence.

Giant impacts are thought to have been common in the early Solar System. Computer simulations of giant impacts have produced results that are consistent with the mass of the lunar core and the angular momentum of the Earth–Moon system. These simulations also show that most of the Moon derived from the impactor, rather than the proto-Earth. However, more recent simulations suggest a larger fraction of the Moon derived from the proto-Earth. Other bodies of the inner Solar System such as Mars and Vesta have, according to meteorites from them, very different oxygen and tungsten isotopic compositions compared to Earth. However, Earth and the Moon have nearly identical isotopic compositions. The isotopic equalization of the Earth-Moon system might be explained by the post-impact mixing of the vaporized material that formed the two, although this is debated.

The impact released a lot of energy and then the released material re-accreted into the Earth–Moon system. This would have melted the outer shell of Earth, and thus formed a magma ocean. Similarly, the newly formed Moon would also have been affected and had its own lunar magma ocean; its depth is estimated from about 500 km (300 miles) to 1,737 km (1,079 miles).

While the giant-impact theory explains many lines of evidence, some questions are still unresolved, most of which involve the Moon's composition.

In 2001, a team at the Carnegie Institute of Washington reported the most precise measurement of the isotopic signatures of lunar rocks. The rocks from the Apollo program had the same isotopic signature as rocks from Earth, differing from almost all other bodies in the Solar System. This observation was unexpected, because most of the material that formed the Moon was thought to come from Theia and it was announced in 2007 that there was less than a 1% chance that Theia and Earth had identical isotopic signatures. Other Apollo lunar samples had in 2012 the same titanium isotopes composition as Earth, which conflicts with what is expected if the Moon formed far from Earth or is derived from Theia. These discrepancies may be explained by variations of the giant-impact theory.

The Moon is a very slightly scalene ellipsoid due to tidal stretching, with its long axis displaced 30° from facing the Earth, due to gravitational anomalies from impact basins. Its shape is more elongated than current tidal forces can account for. This 'fossil bulge' indicates that the Moon solidified when it orbited at half its current distance to the Earth, and that it is now too cold for its shape to adjust to its orbit.

The Moon is a differentiated body in hydrostatic equilibrium. It has a geochemically distinct crust, mantle, and core. The Moon has a solid iron-rich inner core with a radius possibly as small as 240 kilometres (150 mi) and a fluid outer core primarily made of liquid iron with a radius of roughly 300 kilometres (190 mi). Around the core is a partially molten boundary layer with a radius of about 500 kilometres (310 mi). This structure is thought to have developed through the fractional crystallization of a global magma ocean shortly after the Moon's formation 4.5 billion years ago.

Crystallization of this magma ocean would have created a mafic mantle from the precipitation and sinking of the minerals olivine, clinopyroxene, and orthopyroxene; after about three-quarters of the magma ocean had crystallised, lower-density plagioclase minerals could form and float into a crust atop. The final liquids to crystallise would have been initially sandwiched between the crust and mantle, with a high abundance of incompatible and heat-producing elements. Consistent with this perspective, geochemical mapping made from orbit suggests a crust of mostly anorthosite. The Moon rock samples of the flood lavas that erupted onto the surface from partial melting in the mantle confirm the mafic mantle composition, which is more iron-rich than that of Earth. The crust is on average about 50 kilometres (31 mi) thick.

The Moon is the second-densest satellite in the Solar System, after Io. However, the inner core of the Moon is small, with a radius of about 350 kilometres (220 mi) or less, around 20% of the radius of the Moon. Its composition is not well understood, but is probably metallic iron alloyed with a small amount of sulfur and nickel; analyses of the Moon's time-variable rotation suggest that it is at least partly molten. The pressure at the lunar core is estimated to be GPa.

The topography of the Moon has been measured with laser altimetry and stereo image analysis. Its most extensive topographic feature is the giant far-side South Pole–Aitken basin, some 2,240 km (1,390 mi) in diameter, the largest crater on the Moon and the second-largest confirmed impact crater in the Solar System. At 13 km (8.1 mi) deep, its floor is the lowest point on the surface of the Moon. The highest elevations of the Moon's surface are located directly to the northeast, which might have been thickened by the oblique formation impact of the South Pole–Aitken basin. Other large impact basins such as Imbrium, Serenitatis, Crisium, Smythii, and Orientale possess regionally low elevations and elevated rims. The far side of the lunar surface is on average about 1.9 km (1.2 mi) higher than that of the near side.

The discovery of fault scarp cliffs suggest that the Moon has shrunk by about 90 metres (300 ft) within the past billion years. Similar shrinkage features exist on Mercury. Mare Frigoris, a basin near the north pole long assumed to be geologically dead, has cracked and shifted. Since the Moon doesn't have tectonic plates, its tectonic activity is slow and cracks develop as it loses heat.

The dark and relatively featureless lunar plains, clearly seen with the naked eye, are called maria (Latin for "seas"; singular mare), as they were once believed to be filled with water; they are now known to be vast solidified pools of ancient basaltic lava. Although similar to terrestrial basalts, lunar basalts have more iron and no minerals altered by water. The majority of these lava deposits erupted or flowed into the depressions associated with impact basins. Several geologic provinces containing shield volcanoes and volcanic domes are found within the near side "maria".

Almost all maria are on the near side of the Moon, and cover 31% of the surface of the near side compared with 2% of the far side. This is likely due to a concentration of heat-producing elements under the crust on the near side, which would have caused the underlying mantle to heat up, partially melt, rise to the surface and erupt. Most of the Moon's mare basalts erupted during the Imbrian period, 3.0–3.5 billion years ago, although some radiometrically dated samples are as old as 4.2 billion years. As of 2003, crater counting studies of the youngest eruptions appeared to suggest they formed no earlier than 1.2 billion years ago.

In 2006, a study of Ina, a tiny depression in Lacus Felicitatis, found jagged, relatively dust-free features that, because of the lack of erosion by infalling debris, appeared to be only 2 million years old. Moonquakes and releases of gas also indicate some continued lunar activity. Evidence of recent lunar volcanism has been identified at 70 irregular mare patches, some less than 50 million years old. This raises the possibility of a much warmer lunar mantle than previously believed, at least on the near side where the deep crust is substantially warmer because of the greater concentration of radioactive elements. Evidence has been found for 2–10 million years old basaltic volcanism within the crater Lowell, inside the Orientale basin. Some combination of an initially hotter mantle and local enrichment of heat-producing elements in the mantle could be responsible for prolonged activities on the far side in the Orientale basin.

The lighter-colored regions of the Moon are called terrae, or more commonly highlands, because they are higher than most maria. They have been radiometrically dated to having formed 4.4 billion years ago, and may represent plagioclase cumulates of the lunar magma ocean. In contrast to Earth, no major lunar mountains are believed to have formed as a result of tectonic events.

The concentration of maria on the near side likely reflects the substantially thicker crust of the highlands of the Far Side, which may have formed in a slow-velocity impact of a second moon of Earth a few tens of millions of years after the Moon's formation.

The other major geologic process that has affected the Moon's surface is impact cratering, with craters formed when asteroids and comets collide with the lunar surface. There are estimated to be roughly 300,000 craters wider than 1 km (0.6 mi) on the Moon's near side alone. The lunar geologic timescale is based on the most prominent impact events, including Nectaris, Imbrium, and Orientale, structures characterized by multiple rings of uplifted material, between hundreds and thousands of kilometers in diameter and associated with a broad apron of ejecta deposits that form a regional stratigraphic horizon. The lack of an atmosphere, weather and recent geological processes mean that many of these craters are well-preserved. Although only a few multi-ring basins have been definitively dated, they are useful for assigning relative ages. Because impact craters accumulate at a nearly constant rate, counting the number of craters per unit area can be used to estimate the age of the surface. The radiometric ages of impact-melted rocks collected during the Apollo missions cluster between 3.8 and 4.1 billion years old: this has been used to propose a Late Heavy Bombardment of impacts.

Blanketed on top of the Moon's crust is a highly comminuted (broken into ever smaller particles) and impact gardened surface layer called regolith, formed by impact processes. The finer regolith, the lunar soil of silicon dioxide glass, has a texture resembling snow and a scent resembling spent gunpowder. The regolith of older surfaces is generally thicker than for younger surfaces: it varies in thickness from 10–20 km (6.2–12.4 mi) in the highlands and 3–5 km (1.9–3.1 mi) in the maria. Beneath the finely comminuted regolith layer is the megaregolith, a layer of highly fractured bedrock many kilometers thick.

Comparison of high-resolution images obtained by the Lunar Reconnaissance Orbiter has shown a contemporary crater-production rate significantly higher than previously estimated. A secondary cratering process caused by distal ejecta is thought to churn the top two centimeters of regolith a hundred times more quickly than previous models suggested – on a timescale of 81,000 years.

Lunar swirls are enigmatic features found across the Moon's surface. They are characterized by a high albedo, appear optically immature (i.e. the optical characteristics of a relatively young regolith), and have often a sinuous shape. Their shape is often accentuated by low albedo regions that wind between the bright swirls. They are located in places with enhanced surface magnetic fields and many are located at the antipodal point of major impacts. Well known swirls include the Reiner Gamma feature and Mare Ingenii. They are hypothesized to be areas that have been partially shielded from the solar wind, resulting in slower space weathering.

Liquid water cannot persist on the lunar surface. When exposed to solar radiation, water quickly decomposes through a process known as photodissociation and is lost to space. However, since the 1960s, scientists have hypothesized that water ice may be deposited by impacting comets or possibly produced by the reaction of oxygen-rich lunar rocks, and hydrogen from solar wind, leaving traces of water which could possibly persist in cold, permanently shadowed craters at either pole on the Moon. Computer simulations suggest that up to 14,000 km2 (5,400 sq mi) of the surface may be in permanent shadow. The presence of usable quantities of water on the Moon is an important factor in rendering lunar habitation as a cost-effective plan; the alternative of transporting water from Earth would be prohibitively expensive.

In years since, signatures of water have been found to exist on the lunar surface. In 1994, the bistatic radar experiment located on the Clementine spacecraft, indicated the existence of small, frozen pockets of water close to the surface. However, later radar observations by Arecibo, suggest these findings may rather be rocks ejected from young impact craters. In 1998, the neutron spectrometer on the Lunar Prospector spacecraft showed that high concentrations of hydrogen are present in the first meter of depth in the regolith near the polar regions. Volcanic lava beads, brought back to Earth aboard Apollo 15, showed small amounts of water in their interior.

The 2008 Chandrayaan-1 spacecraft has since confirmed the existence of surface water ice, using the on-board Moon Mineralogy Mapper. The spectrometer observed absorption lines common to hydroxyl, in reflected sunlight, providing evidence of large quantities of water ice, on the lunar surface. The spacecraft showed that concentrations may possibly be as high as 1,000 ppm. Using the mapper's reflectance spectra, indirect lighting of areas in shadow confirmed water ice within 20° latitude of both poles in 2018. In 2009, LCROSS sent a 2,300 kg (5,100 lb) impactor into a permanently shadowed polar crater, and detected at least 100 kg (220 lb) of water in a plume of ejected material. Another examination of the LCROSS data showed the amount of detected water to be closer to 155 ± 12 kg (342 ± 26 lb).

In May 2011, 615–1410 ppm water in melt inclusions in lunar sample 74220 was reported, the famous high-titanium "orange glass soil" of volcanic origin collected during the Apollo 17 mission in 1972. The inclusions were formed during explosive eruptions on the Moon approximately 3.7 billion years ago. This concentration is comparable with that of magma in Earth's upper mantle. Although of considerable selenological interest, this announcement affords little comfort to would-be lunar colonists – the sample originated many kilometers below the surface, and the inclusions are so difficult to access that it took 39 years to find them with a state-of-the-art ion microprobe instrument.

Analysis of the findings of the Moon Mineralogy Mapper (M3) revealed in August 2018 for the first time "definitive evidence" for water-ice on the lunar surface. The data revealed the distinct reflective signatures of water-ice, as opposed to dust and other reflective substances. The ice deposits were found on the North and South poles, although it is more abundant in the South, where water is trapped in permanently shadowed craters and crevices, allowing it to persist as ice on the surface since they are shielded from the sun.

In October 2020, astronomers reported detecting molecular water on the sunlit surface of the Moon by several independent spacecraft, including the Stratospheric Observatory for Infrared Astronomy (SOFIA).

The gravitational field of the Moon has been measured through tracking the Doppler shift of radio signals emitted by orbiting spacecraft. The main lunar gravity features are mascons, large positive gravitational anomalies associated with some of the giant impact basins, partly caused by the dense mare basaltic lava flows that fill those basins. The anomalies greatly influence the orbit of spacecraft about the Moon. There are some puzzles: lava flows by themselves cannot explain all of the gravitational signature, and some mascons exist that are not linked to mare volcanism.

The Moon has an external magnetic field of generally less than 0.2 nanoteslas, or less than one hundred thousandth that of Earth. The Moon does not currently have a global dipolar magnetic field and only has crustal magnetization likely acquired early in its history when a dynamo was still operating. However, early in its history, 4 billion years ago, its magnetic field strength was likely close to that of Earth today. This early dynamo field apparently expired by about one billion years ago, after the lunar core had completely crystallized. Theoretically, some of the remnant magnetization may originate from transient magnetic fields generated during large impacts through the expansion of plasma clouds. These clouds are generated during large impacts in an ambient magnetic field. This is supported by the location of the largest crustal magnetizations situated near the antipodes of the giant impact basins.

The Moon has an atmosphere so tenuous as to be nearly vacuum, with a total mass of less than 10 tonnes (9.8 long tons; 11 short tons). The surface pressure of this small mass is around 3 × 10−15 atm (0.3 nPa); it varies with the lunar day. Its sources include outgassing and sputtering, a product of the bombardment of lunar soil by solar wind ions. Elements that have been detected include sodium and potassium, produced by sputtering (also found in the atmospheres of Mercury and Io); helium-4 and neon from the solar wind; and argon-40, radon-222, and polonium-210, outgassed after their creation by radioactive decay within the crust and mantle. The absence of such neutral species (atoms or molecules) as oxygen, nitrogen, carbon, hydrogen and magnesium, which are present in the regolith, is not understood. Water vapor has been detected by Chandrayaan-1 and found to vary with latitude, with a maximum at ~60–70 degrees; it is possibly generated from the sublimation of water ice in the regolith. These gases either return into the regolith because of the Moon's gravity or are lost to space, either through solar radiation pressure or, if they are ionized, by being swept away by the solar wind's magnetic field.

A permanent Moon dust cloud exists around the Moon, generated by small particles from comets. Estimates are 5 tons of comet particles strike the Moon's surface every 24 hours, resulting in the ejection of dust particles. The dust stays above the Moon approximately 10 minutes, taking 5 minutes to rise, and 5 minutes to fall. On average, 120 kilograms of dust are present above the Moon, rising up to 100 kilometers above the surface. Dust counts made by LADEE's Lunar Dust EXperiment (LDEX) found particle counts peaked during the Geminid, Quadrantid, Northern Taurid, and Omicron Centaurid meteor showers, when the Earth, and Moon pass through comet debris. The lunar dust cloud is asymmetric, being more dense near the boundary between the Moon's dayside and nightside.

Studies of Moon magma samples retrieved by the Apollo missions demonstrate that the Moon had once possessed a relatively thick atmosphere for a period of 70 million years between 3 and 4 billion years ago. This atmosphere, sourced from gases ejected from lunar volcanic eruptions, was twice the thickness of that of present-day Mars. The ancient lunar atmosphere was eventually stripped away by solar winds and dissipated into space.

Scale model of the Earth–Moon system: Sizes and distances are to scale.

Because of tidal locking, the rotation of the Moon around its own axis is synchronous to its orbital period around the Earth. The Moon makes a complete orbit around Earth with respect to the fixed stars about once every 27.3 days, its sidereal period. However, because Earth is moving in its orbit around the Sun at the same time, it takes slightly longer for the Moon to show the same phase to Earth, which is about 29.5 days; its synodic period.

Unlike most satellites of other planets, the Moon orbits closer to the ecliptic plane than to the planet's equatorial plane. The Moon's orbit is subtly perturbed by the Sun and Earth in many small, complex and interacting ways. For example, the plane of the Moon's orbit gradually rotates once every 18.61 years, which affects other aspects of lunar motion. These follow-on effects are mathematically described by Cassini's laws.

The Moon's axial tilt with respect to the ecliptic is only 1.5424°, much less than the 23.44° of Earth. Because of this, the Moon's solar illumination varies much less with season, and topographical details play a crucial role in seasonal effects. From images taken by Clementine in 1994, it appears that four mountainous regions on the rim of the crater Peary at the Moon's north pole may remain illuminated for the entire lunar day, creating peaks of eternal light. No such regions exist at the south pole. Similarly, there are places that remain in permanent shadow at the bottoms of many polar craters, and these "craters of eternal darkness" are extremely cold: Lunar Reconnaissance Orbiter measured the lowest summer temperatures in craters at the southern pole at 35 K (−238 °C; −397 °F) and just 26 K (−247 °C; −413 °F) close to the winter solstice in the north polar crater Hermite. This is the coldest temperature in the Solar System ever measured by a spacecraft, colder even than the surface of Pluto. Average temperatures of the Moon's surface are reported, but temperatures of different areas will vary greatly depending upon whether they are in sunlight or shadow.

The Moon is an exceptionally large natural satellite relative to Earth: Its diameter is more than a quarter and its mass is 1/81 of Earth's. It is the largest moon in the Solar System relative to the size of its planet, though Charon is larger relative to the dwarf planet Pluto, at 1/9 Pluto's mass. The Earth and the Moon's barycentre, their common center of mass, is located 1,700 km (1,100 mi) (about a quarter of Earth's radius) beneath the Earth's surface.

The Earth revolves around the Earth-Moon barycentre once a sidereal month, with 1/81 the speed of the Moon, or about 12.5 metres (41 ft) per second. This motion is superimposed on the much larger revolution of the Earth around the Sun at a speed of about 30 kilometres (19 mi) per second.

The surface area of the Moon is slightly less than the areas of North and South America combined.

The synchronous rotation of the Moon as it orbits the Earth results in it always keeping nearly the same face turned towards the planet. However, because of the effect of libration, about 59% of the Moon's surface can actually be seen from Earth. The side of the Moon that faces Earth is called the near side, and the opposite the far side. The far side is often inaccurately called the "dark side", but it is in fact illuminated as often as the near side: once every 29.5 Earth days. During new moon, the near side is dark.

The Moon originally rotated at a faster rate, but early in its history its rotation slowed and became tidally locked in this orientation as a result of frictional effects associated with tidal deformations caused by Earth. With time, the energy of rotation of the Moon on its axis was dissipated as heat, until there was no rotation of the Moon relative to Earth. In 2016, planetary scientists using data collected on the 1998-99 NASA Lunar Prospector mission, found two hydrogen-rich areas (most likely former water ice) on opposite sides of the Moon. It is speculated that these patches were the poles of the Moon billions of years ago before it was tidally locked to Earth.

The Moon has an exceptionally low albedo, giving it a reflectance that is slightly brighter than that of worn asphalt. Despite this, it is the brightest object in the sky after the Sun. This is due partly to the brightness enhancement of the opposition surge; the Moon at quarter phase is only one-tenth as bright, rather than half as bright, as at full moon. Additionally, color constancy in the visual system recalibrates the relations between the colors of an object and its surroundings, and because the surrounding sky is comparatively dark, the sunlit Moon is perceived as a bright object. The edges of the full moon seem as bright as the center, without limb darkening, because of the reflective properties of lunar soil, which retroreflects light more towards the Sun than in other directions. The Moon does appear larger when close to the horizon, but this is a purely psychological effect, known as the Moon illusion, first described in the 7th century BC. The full Moon's angular diameter is about 0.52° (on average) in the sky, roughly the same apparent size as the Sun (see § Eclipses).

The Moon's highest altitude at culmination varies by its phase and time of year. The full moon is highest in the sky during winter (for each hemisphere). The orientation of the Moon's crescent also depends on the latitude of the viewing location; an observer in the tropics can see a smile-shaped crescent Moon. The Moon is visible for two weeks every 27.3 days at the North and South Poles. Zooplankton in the Arctic use moonlight when the Sun is below the horizon for months on end.

The distance between the Moon and Earth varies from around 356,400 km (221,500 mi) to 406,700 km (252,700 mi) at perigee (closest) and apogee (farthest), respectively. On 14 November 2016, it was closer to Earth when at full phase than it has been since 1948, 14% closer than its farthest position in apogee. Reported as a "supermoon", this closest point coincided within an hour of a full moon, and it was 30% more luminous than when at its greatest distance because its angular diameter is 14% greater and . At lower levels, the human perception of reduced brightness as a percentage is provided by the following formula:

When the actual reduction is 1.00 / 1.30, or about 0.770, the perceived reduction is about 0.877, or 1.00 / 1.14. This gives a maximum perceived increase of 14% between apogee and perigee moons of the same phase.

There has been historical controversy over whether features on the Moon's surface change over time. Today, many of these claims are thought to be illusory, resulting from observation under different lighting conditions, poor astronomical seeing, or inadequate drawings. However, outgassing does occasionally occur and could be responsible for a minor percentage of the reported lunar transient phenomena. Recently, it has been suggested that a roughly 3 km (1.9 mi) diameter region of the lunar surface was modified by a gas release event about a million years ago.

The Moon's appearance, like the Sun's, can be affected by Earth's atmosphere. Common optical effects are the 22° halo ring, formed when the Moon's light is refracted through the ice crystals of high cirrostratus clouds, and smaller coronal rings when the Moon is seen through thin clouds.

The illuminated area of the visible sphere (degree of illumination) is given by , where is the elongation (i.e., the angle between Moon, the observer on Earth, and the Sun).

The gravitational attraction that masses have for one another decreases inversely with the square of the distance of those masses from each other. As a result, the slightly greater attraction that the Moon has for the side of Earth closest to the Moon, as compared to the part of the Earth opposite the Moon, results in tidal forces. Tidal forces affect both the Earth's crust and oceans.

The most obvious effect of tidal forces is to cause two bulges in the Earth's oceans, one on the side facing the Moon and the other on the side opposite. This results in elevated sea levels called ocean tides. As the Earth rotates on its axis, one of the ocean bulges (high tide) is held in place "under" the Moon, while another such tide is opposite. As a result, there are two high tides, and two low tides in about 24 hours. Since the Moon is orbiting the Earth in the same direction of the Earth's rotation, the high tides occur about every 12 hours and 25 minutes; the 25 minutes is due to the Moon's time to orbit the Earth. The Sun has the same tidal effect on the Earth, but its forces of attraction are only 40% that of the Moon's; the Sun's and Moon's interplay is responsible for spring and neap tides. If the Earth were a water world (one with no continents) it would produce a tide of only one meter, and that tide would be very predictable, but the ocean tides are greatly modified by other effects: the frictional coupling of water to Earth's rotation through the ocean floors, the inertia of water's movement, ocean basins that grow shallower near land, the sloshing of water between different ocean basins. As a result, the timing of the tides at most points on the Earth is a product of observations that are explained, incidentally, by theory.

While gravitation causes acceleration and movement of the Earth's fluid oceans, gravitational coupling between the Moon and Earth's solid body is mostly elastic and plastic. The result is a further tidal effect of the Moon on the Earth that causes a bulge of the solid portion of the Earth nearest the Moon that acts as a torque in opposition to the Earth's rotation. This "drains" angular momentum and rotational kinetic energy from Earth's rotation, slowing the Earth's rotation. That angular momentum, lost from the Earth, is transferred to the Moon in a process (confusingly known as tidal acceleration), which lifts the Moon into a higher orbit and results in its lower orbital speed about the Earth. Thus the distance between Earth and Moon is increasing, and the Earth's rotation is slowing in reaction. Measurements from laser reflectors left during the Apollo missions (lunar ranging experiments) have found that the Moon's distance increases by 38 mm (1.5 in) per year (roughly the rate at which human fingernails grow). Atomic clocks also show that Earth's day lengthens by about 15 microseconds every year, slowly increasing the rate at which UTC is adjusted by leap seconds. This tidal drag would continue until the rotation of Earth and the orbital period of the Moon matched, creating mutual tidal locking between the two and suspending the Moon over one meridian (this is currently the case with Pluto and its moon Charon). However, the Sun will become a red giant engulfing the Earth-Moon system long before this occurrence. If this tidal locking did happen, the rotation of the Earth would continue to slow down because of the tides caused by the Sun. With the day longer than the month, the Moon would then move slowly from west to east in the sky. The tides caused by the Moon would then cause the opposite effect from before, and the Moon would get closer to the Earth. It would eventually come within the Roche limit and be broken up into a ring.[citation needed]

In a like manner, the lunar surface experiences tides of around 10 cm (4 in) amplitude over 27 days, with two components: a fixed one due to Earth, because they are in synchronous rotation, and a varying component from the Sun. The Earth-induced component arises from libration, a result of the Moon's orbital eccentricity (if the Moon's orbit were perfectly circular, there would only be solar tides). Libration also changes the angle from which the Moon is seen, allowing a total of about 59% of its surface to be seen from Earth over time. The cumulative effects of stress built up by these tidal forces produces moonquakes. Moonquakes are much less common and weaker than are earthquakes, although moonquakes can last for up to an hour – significantly longer than terrestrial quakes – because of the absence of water to damp out the seismic vibrations. The existence of moonquakes was an unexpected discovery from seismometers placed on the Moon by Apollo astronauts from 1969 through 1972.

According to recent research, scientists suggest that the Moon's influence on the Earth may contribute to maintaining Earth's magnetic field.

Eclipses only occur when the Sun, Earth, and Moon are all in a straight line (termed "syzygy"). Solar eclipses occur at new moon, when the Moon is between the Sun and Earth. In contrast, lunar eclipses occur at full moon, when Earth is between the Sun and Moon. The apparent size of the Moon is roughly the same as that of the Sun, with both being viewed at close to one-half a degree wide. The Sun is much larger than the Moon but it is the vastly greater distance that gives it the same apparent size as the much closer and much smaller Moon from the perspective of Earth. The variations in apparent size, due to the non-circular orbits, are nearly the same as well, though occurring in different cycles. This makes possible both total (with the Moon appearing larger than the Sun) and annular (with the Moon appearing smaller than the Sun) solar eclipses. In a total eclipse, the Moon completely covers the disc of the Sun and the solar corona becomes visible to the naked eye. Because the distance between the Moon and Earth is very slowly increasing over time, the angular diameter of the Moon is decreasing. Also, as it evolves toward becoming a red giant, the size of the Sun, and its apparent diameter in the sky, are slowly increasing. The combination of these two changes means that hundreds of millions of years ago, the Moon would always completely cover the Sun on solar eclipses, and no annular eclipses were possible. Likewise, hundreds of millions of years in the future, the Moon will no longer cover the Sun completely, and total solar eclipses will not occur.

Because the Moon's orbit around Earth is inclined by about 5.145° (5° 9') to the orbit of Earth around the Sun, eclipses do not occur at every full and new moon. For an eclipse to occur, the Moon must be near the intersection of the two orbital planes. The periodicity and recurrence of eclipses of the Sun by the Moon, and of the Moon by Earth, is described by the saros, which has a period of approximately 18 years.

Because the Moon continuously blocks the view of a half-degree-wide circular area of the sky, the related phenomenon of occultation occurs when a bright star or planet passes behind the Moon and is occulted: hidden from view. In this way, a solar eclipse is an occultation of the Sun. Because the Moon is comparatively close to Earth, occultations of individual stars are not visible everywhere on the planet, nor at the same time. Because of the precession of the lunar orbit, each year different stars are occulted.

One of the earliest-discovered possible depictions of the Moon is a 5000-year-old rock carving Orthostat 47 at Knowth, Ireland.

Understanding of the Moon's cycles was an early development of astronomy: by the 5th century BC, Babylonian astronomers had recorded the 18-year Saros cycle of lunar eclipses, and Indian astronomers had described the Moon's monthly elongation. The Chinese astronomer Shi Shen (fl. 4th century BC) gave instructions for predicting solar and lunar eclipses.(p411) Later, the physical form of the Moon and the cause of moonlight became understood. The ancient Greek philosopher Anaxagoras (d. 428 BC) reasoned that the Sun and Moon were both giant spherical rocks, and that the latter reflected the light of the former.(p227) Although the Chinese of the Han Dynasty believed the Moon to be energy equated to qi, their 'radiating influence' theory also recognized that the light of the Moon was merely a reflection of the Sun, and Jing Fang (78–37 BC) noted the sphericity of the Moon.(pp413–414) In the 2nd century AD, Lucian wrote the novel A True Story, in which the heroes travel to the Moon and meet its inhabitants. In 499 AD, the Indian astronomer Aryabhata mentioned in his Aryabhatiya that reflected sunlight is the cause of the shining of the Moon. The astronomer and physicist Alhazen (965–1039) found that sunlight was not reflected from the Moon like a mirror, but that light was emitted from every part of the Moon's sunlit surface in all directions. Shen Kuo (1031–1095) of the Song dynasty created an allegory equating the waxing and waning of the Moon to a round ball of reflective silver that, when doused with white powder and viewed from the side, would appear to be a crescent.(pp415–416)

In Aristotle's (384–322 BC) description of the universe, the Moon marked the boundary between the spheres of the mutable elements (earth, water, air and fire), and the imperishable stars of aether, an influential philosophy that would dominate for centuries. However, in the 2nd century BC, Seleucus of Seleucia correctly theorized that tides were due to the attraction of the Moon, and that their height depends on the Moon's position relative to the Sun. In the same century, Aristarchus computed the size and distance of the Moon from Earth, obtaining a value of about twenty times the radius of Earth for the distance. These figures were greatly improved by Ptolemy (90–168 AD): his values of a mean distance of 59 times Earth's radius and a diameter of 0.292 Earth diameters were close to the correct values of about 60 and 0.273 respectively. Archimedes (287–212 BC) designed a planetarium that could calculate the motions of the Moon and other objects in the Solar System.

During the Middle Ages, before the invention of the telescope, the Moon was increasingly recognised as a sphere, though many believed that it was "perfectly smooth".

In 1609, Galileo Galilei used an early telescope to make drawings of the Moon for his book Sidereus Nuncius, and deduced that it was not smooth but had mountains and craters. Thomas Harriot had made, but not published such drawings a few months earlier. Telescopic mapping of the Moon followed: later in the 17th century, the efforts of Giovanni Battista Riccioli and Francesco Maria Grimaldi led to the system of naming of lunar features in use today. The more exact 1834–1836 Mappa Selenographica of Wilhelm Beer and Johann Heinrich Mädler, and their associated 1837 book Der Mond, the first trigonometrically accurate study of lunar features, included the heights of more than a thousand mountains, and introduced the study of the Moon at accuracies possible in earthly geography. Lunar craters, first noted by Galileo, were thought to be volcanic until the 1870s proposal of Richard Proctor that they were formed by collisions. This view gained support in 1892 from the experimentation of geologist Grove Karl Gilbert, and from comparative studies from 1920 to the 1940s, leading to the development of lunar stratigraphy, which by the 1950s was becoming a new and growing branch of astrogeology.

Between the first human arrival with the robotic Soviet Luna program in 1958, to the 1970s with the last Missions of the crewed U.S. Apollo landings and last Luna mission in 1976, the Cold War-inspired Space Race between the Soviet Union and the U.S. led to an acceleration of interest in exploration of the Moon. Once launchers had the necessary capabilities, these nations sent uncrewed probes on both flyby and impact/lander missions.

Spacecraft from the Soviet Union's Luna program were the first to accomplish a number of goals: following three unnamed, failed missions in 1958, the first human-made object to escape Earth's gravity and pass near the Moon was Luna 1; the first human-made object to impact the lunar surface was Luna 2, and the first photographs of the normally occluded far side of the Moon were made by Luna 3, all in 1959.

The first spacecraft to perform a successful lunar soft landing was Luna 9 and the first uncrewed vehicle to orbit the Moon was Luna 10, both in 1966. Rock and soil samples were brought back to Earth by three Luna sample return missions (Luna 16 in 1970, Luna 20 in 1972, and Luna 24 in 1976), which returned 0.3 kg total. Two pioneering robotic rovers landed on the Moon in 1970 and 1973 as a part of Soviet Lunokhod programme.

Luna 24 was the last Soviet mission to the Moon.

During the late 1950s at the height of the Cold War, the United States Army conducted a classified feasibility study that proposed the construction of a staffed military outpost on the Moon called Project Horizon with the potential to conduct a wide range of missions from scientific research to nuclear Earth bombardment. The study included the possibility of conducting a lunar-based nuclear test. The Air Force, which at the time was in competition with the Army for a leading role in the space program, developed its own similar plan called Lunex. However, both these proposals were ultimately passed over as the space program was largely transferred from the military to the civilian agency NASA.

Following President John F. Kennedy's 1961 commitment to a manned Moon landing before the end of the decade, the United States, under NASA leadership, launched a series of uncrewed probes to develop an understanding of the lunar surface in preparation for human missions: the Jet Propulsion Laboratory's Ranger program produced the first close-up pictures; the Lunar Orbiter program produced maps of the entire Moon; the Surveyor program landed its first spacecraft four months after Luna 9. The crewed Apollo program was developed in parallel; after a series of uncrewed and crewed tests of the Apollo spacecraft in Earth orbit, and spurred on by a potential Soviet lunar human landing, in 1968 Apollo 8 made the first human mission to lunar orbit. The subsequent landing of the first humans on the Moon in 1969 is seen by many as the culmination of the Space Race.

Neil Armstrong became the first person to walk on the Moon as the commander of the American mission Apollo 11 by first setting foot on the Moon at 02:56 UTC on 21 July 1969. An estimated 500 million people worldwide watched the transmission by the Apollo TV camera, the largest television audience for a live broadcast at that time. The Apollo missions 11 to 17 (except Apollo 13, which aborted its planned lunar landing) removed 380.05 kilograms (837.87 lb) of lunar rock and soil in 2,196 separate samples. The American Moon landing and return was enabled by considerable technological advances in the early 1960s, in domains such as ablation chemistry, software engineering, and atmospheric re-entry technology, and by highly competent management of the enormous technical undertaking.

Scientific instrument packages were installed on the lunar surface during all the Apollo landings. Long-lived instrument stations, including heat flow probes, seismometers, and magnetometers, were installed at the Apollo 12, 14, 15, 16, and 17 landing sites. Direct transmission of data to Earth concluded in late 1977 because of budgetary considerations, but as the stations' lunar laser ranging corner-cube retroreflector arrays are passive instruments, they are still being used. Ranging to the stations is routinely performed from Earth-based stations with an accuracy of a few centimeters, and data from this experiment are being used to place constraints on the size of the lunar core.

In the 1970s, after the Moon race, the focus of astronautic exploration shifted, as probes like Pioneer 10 and the Voyager program were sent towards the outer solar system. Years of near lunar quietude followed, only broken by a beginning internationalization of space and the Moon through, for example, the negotiation of the Moon treaty.

Since the 1990s, many more countries have become involved in direct exploration of the Moon. In 1990, Japan became the third country to place a spacecraft into lunar orbit with its Hiten spacecraft. The spacecraft released a smaller probe, Hagoromo, in lunar orbit, but the transmitter failed, preventing further scientific use of the mission. In 1994, the U.S. sent the joint Defense Department/NASA spacecraft Clementine to lunar orbit. This mission obtained the first near-global topographic map of the Moon, and the first global multispectral images of the lunar surface. This was followed in 1998 by the Lunar Prospector mission, whose instruments indicated the presence of excess hydrogen at the lunar poles, which is likely to have been caused by the presence of water ice in the upper few meters of the regolith within permanently shadowed craters.

The European spacecraft SMART-1, the second ion-propelled spacecraft, was in lunar orbit from 15 November 2004 until its lunar impact on 3 September 2006, and made the first detailed survey of chemical elements on the lunar surface.

The ambitious Chinese Lunar Exploration Program began with Chang'e 1, which successfully orbited the Moon from 5 November 2007 until its controlled lunar impact on 1 March 2009. It obtained a full image map of the Moon. Chang'e 2, beginning in October 2010, reached the Moon more quickly, mapped the Moon at a higher resolution over an eight-month period, then left lunar orbit for an extended stay at the Earth–Sun L2 Lagrangian point, before finally performing a flyby of asteroid 4179 Toutatis on 13 December 2012, and then heading off into deep space. On 14 December 2013, Chang'e 3 landed a lunar lander onto the Moon's surface, which in turn deployed a lunar rover, named Yutu (Chinese: 玉兔; literally "Jade Rabbit"). This was the first lunar soft landing since Luna 24 in 1976, and the first lunar rover mission since Lunokhod 2 in 1973. Another rover mission (Chang'e 4) was launched in 2019, becoming the first ever spacecraft to land on the Moon's far side. China intends to following this up with a sample return mission (Chang'e 5) in 2020.

Between 4 October 2007 and 10 June 2009, the Japan Aerospace Exploration Agency's Kaguya (Selene) mission, a lunar orbiter fitted with a high-definition video camera, and two small radio-transmitter satellites, obtained lunar geophysics data and took the first high-definition movies from beyond Earth orbit. India's first lunar mission, Chandrayaan-1, orbited from 8 November 2008 until loss of contact on 27 August 2009, creating a high-resolution chemical, mineralogical and photo-geological map of the lunar surface, and confirming the presence of water molecules in lunar soil. The Indian Space Research Organisation planned to launch Chandrayaan-2 in 2013, which would have included a Russian robotic lunar rover. However, the failure of Russia's Fobos-Grunt mission has delayed this project, and was launched on 22 July 2019. The lander Vikram attempted to land on the lunar south pole region on 6 September, but lost the signal in 2.1 km (1.3 mi). What happened after that is unknown.

The U.S. co-launched the Lunar Reconnaissance Orbiter (LRO) and the LCROSS impactor and follow-up observation orbiter on 18 June 2009; LCROSS completed its mission by making a planned and widely observed impact in the crater Cabeus on 9 October 2009, whereas LRO is currently in operation, obtaining precise lunar altimetry and high-resolution imagery. In November 2011, the LRO passed over the large and bright crater Aristarchus. NASA released photos of the crater on 25 December 2011.

Two NASA GRAIL spacecraft began orbiting the Moon around 1 January 2012, on a mission to learn more about the Moon's internal structure. NASA's LADEE probe, designed to study the lunar exosphere, achieved orbit on 6 October 2013.

Upcoming lunar missions include Russia's Luna-Glob: an uncrewed lander with a set of seismometers, and an orbiter based on its failed Martian Fobos-Grunt mission. Privately funded lunar exploration has been promoted by the Google Lunar X Prize, announced 13 September 2007, which offers US$20 million to anyone who can land a robotic rover on the Moon and meet other specified criteria.

NASA began to plan to resume human missions following the call by U.S. President George W. Bush on 14 January, 2004 for a human mission to the Moon by 2019 and the construction of a lunar base by 2024. The Constellation program was funded and construction and testing begun on a crewed spacecraft and launch vehicle, and design studies for a lunar base. That program was cancelled in 2010, however, and was eventually replaced with the Donald Trump supported Artemis program, which plans to return humans to the Moon by 2025. India had also expressed its hope to send people to the Moon by 2020.

On 28 February 2018, SpaceX, Vodafone, Nokia and Audi announced a collaboration to install a 4G wireless communication network on the Moon, with the aim of streaming live footage on the surface to Earth.

Recent reports also indicate NASA's intent to send a woman astronaut to the Moon in their planned mid-2020s mission.

In 2007, the X Prize Foundation together with Google launched the Google Lunar X Prize to encourage commercial endeavors to the Moon. A prize of $20 million was to be awarded to the first private venture to get to the Moon with a robotic lander by the end of March 2018, with additional prizes worth $10 million for further milestones. As of August 2016, 16 teams were reportedly participating in the competition. In January 2018 the foundation announced that the prize would go unclaimed as none of the finalist teams would be able to make a launch attempt by the deadline.

In August 2016, the US government granted permission to US-based start-up Moon Express to land on the Moon. This marked the first time that a private enterprise was given the right to do so. The decision is regarded as a precedent helping to define regulatory standards for deep-space commercial activity in the future. Previously, private companies were restricted to operating on or around Earth.

On 29 November 2018 NASA announced that nine commercial companies would compete to win a contract to send small payloads to the Moon in what is known as Commercial Lunar Payload Services. According to NASA administrator Jim Bridenstine, "We are building a domestic American capability to get back and forth to the surface of the moon.".

Beside the traces of human activity on the Moon, there have been some intended permanent installations like the Moon Museum art piece, Apollo 11 goodwill messages, Lunar plaque, the Fallen Astronaut memorial, and other artifacts.

Longterm missions continuing to be active are some orbiters such as the 2009-launched Lunar Reconnaissance Orbiter surveilling the Moon for future missions, as well as some Landers such as the 2013-launched Chang'e 3 with its Lunar Ultraviolet Telescope still operational.

There are several missions by different agencies and companies planned to establish a longterm human presence on the Moon, with the Lunar Gateway as the currently most advanced project as part of the Artemis program.

For many years, the Moon has been recognized as an excellent site for telescopes. It is relatively nearby; astronomical seeing is not a concern; certain craters near the poles are permanently dark and cold, and thus especially useful for infrared telescopes; and radio telescopes on the far side would be shielded from the radio chatter of Earth. The lunar soil, although it poses a problem for any moving parts of telescopes, can be mixed with carbon nanotubes and epoxies and employed in the construction of mirrors up to 50 meters in diameter. A lunar zenith telescope can be made cheaply with an ionic liquid.

In April 1972, the Apollo 16 mission recorded various astronomical photos and spectra in ultraviolet with the Far Ultraviolet Camera/Spectrograph.

Humans have stayed for days on the Moon, such as during Apollo 17. One particular challenge for astronauts' daily life during their stay on the surface is the lunar dust sticking to their suits and being carried into their quarters. Subsequently, the dust was tasted and smelled by the astronauts, calling it the "Apollo aroma". This contamination poses a danger since the fine lunar dust can cause health issues.

In 2019 at least one plant seed sprouted in an experiment, carried along with other small life from Earth on the Chang'e 4 lander in its Lunar Micro Ecosystem.

Although Luna landers scattered pennants of the Soviet Union on the Moon, and U.S. flags were symbolically planted at their landing sites by the Apollo astronauts, no nation claims ownership of any part of the Moon's surface. Russia, China, India, and the U.S. are party to the 1967 Outer Space Treaty, which defines the Moon and all outer space as the "province of all mankind". This treaty also restricts the use of the Moon to peaceful purposes, explicitly banning military installations and weapons of mass destruction. The 1979 Moon Agreement was created to restrict the exploitation of the Moon's resources by any single nation, but as of January 2020, it has been signed and ratified by only 18 nations, none of which engages in self-launched human space exploration. Although several individuals have made claims to the Moon in whole or in part, none of these are considered credible.

In 2020, U.S. President Donald Trump signed an executive order called "Encouraging International Support for the Recovery and Use of Space Resources". The order emphasizes that "the United States does not view outer space as a 'global commons'" and calls the Moon Agreement "a failed attempt at constraining free enterprise."

The Declaration of the Rights of the Moon was created by a group of "lawyers, space archaeologists and concerned citizens" in 2021, drawing on precedents in the Rights of Nature movement and the concept of legal personality for non-human entities in space.

The contrast between the brighter highlands and the darker maria creates the patterns seen by different cultures as the Man in the Moon, the rabbit and the buffalo, among others. In many prehistoric and ancient cultures, the Moon was personified as a deity or other supernatural phenomenon, and astrological views of the Moon continue to be propagated.

In Proto-Indo-European religion, the Moon was personified as the male god *Meh1not. The ancient Sumerians believed that the Moon was the god Nanna, who was the father of Inanna, the goddess of the planet Venus, and Utu, the god of the Sun. Nanna was later known as Sîn, and was particularly associated with magic and sorcery. In Greco-Roman mythology, the Sun and the Moon are represented as male and female, respectively (Helios/Sol and Selene/Luna); this is a development unique to the eastern Mediterranean and traces of an earlier male moon god in the Greek tradition are preserved in the figure of Menelaus.

In Mesopotamian iconography, the crescent was the primary symbol of Nanna-Sîn. In ancient Greek art, the Moon goddess Selene was represented wearing a crescent on her headgear in an arrangement reminiscent of horns. The star and crescent arrangement also goes back to the Bronze Age, representing either the Sun and Moon, or the Moon and planet Venus, in combination. It came to represent the goddess Artemis or Hecate, and via the patronage of Hecate came to be used as a symbol of Byzantium.

An iconographic tradition of representing Sun and Moon with faces developed in the late medieval period.

The splitting of the Moon (Arabic: انشقاق القمر‎) is a miracle attributed to Muhammad. A song titled 'Moon Anthem' was released on the occasion of landing of India's Chandrayan-II on the Moon.

The Moon's regular phases make it a convenient timepiece, and the periods of its waxing and waning form the basis of many of the oldest calendars. Tally sticks, notched bones dating as far back as 20–30,000 years ago, are believed by some to mark the phases of the Moon. The ~30-day month is an approximation of the lunar cycle. The English noun month and its cognates in other Germanic languages stem from Proto-Germanic *mǣnṓth-, which is connected to the above-mentioned Proto-Germanic *mǣnōn, indicating the usage of a lunar calendar among the Germanic peoples (Germanic calendar) prior to the adoption of a solar calendar. The PIE root of moon, *méh1nōt, derives from the PIE verbal root *meh1-, "to measure", "indicat[ing] a functional conception of the Moon, i.e. marker of the month" (cf. the English words measure and menstrual), and echoing the Moon's importance to many ancient cultures in measuring time (see Latin mensis and Ancient Greek μείς (meis) or μήν (mēn), meaning "month"). Most historical calendars are lunisolar. The 7th-century Islamic calendar is an example of a purely lunar calendar, where months are traditionally determined by the visual sighting of the hilal, or earliest crescent moon, over the horizon.

The lunar effect is a purported unproven correlation between specific stages of the roughly 29.5-day lunar cycle and behavior and physiological changes in living beings on Earth, including humans.

The Moon has long been particularly associated with insanity and irrationality; the words lunacy and lunatic (popular shortening loony) are derived from the Latin name for the Moon, Luna. Philosophers Aristotle and Pliny the Elder argued that the full moon induced insanity in susceptible individuals, believing that the brain, which is mostly water, must be affected by the Moon and its power over the tides, but the Moon's gravity is too slight to affect any single person. Even today, people who believe in a lunar effect claim that admissions to psychiatric hospitals, traffic accidents, homicides or suicides increase during a full moon, but dozens of studies invalidate these claims.

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Each arrow () may be read as "within" or "part of".

it’s not delivery it’s moon physics
@only_the_moon_ ㅋㅋ 여느님은 광고도 어색하지 않게 잘하시던데 갸는 그냥 어색해요 ㅋ
- FICHA DOS DORAMERS primeiro dorama: hwarang dorama fav: W dorama que menos gostei: love alarm um que recomendo:…
@miguelestebantv Hasta Sailor Moon le debe su existencia a este señor, el genero shoujo de magical girl lo creó él con su obra Cutie Honey
@VeganRealness We have the same sun, moon and rising broo
@tsukiusa_moon 大丈夫か大丈夫か(ライトで頭を殴ろうとする)
The other night calum & I were out in the desert and we saw a fricken moon rainbow. Here’s my reaction 😂
I don’t know NOTHING. But you can take this to Equity Bank. BBI will FAIL if all Uhuru Kenyatta does is BLOVIATE…
50 years ago today, Alan Shepard, the 1st American in space, headed to the Moon with Stuart Roosa and Edgar Mitchel…
Kaepernick took a knee and all the NFL owners decided they'd rather lose billions than hire him. Marjorie Taylor G…
RT @mmusetuan: ตี4:56 ของวัน 1 กุมภา ตามเวลาไทยค่ะ จารึกไว้ว่าวันนี้พี่มาร์คได้กลับไปถึงบ้านเรียบร้อยแล้ว ได้กลับไปอยู่ครอบครัวหลังจากที่ต้…
RT @ineedacat1: 저 찐따는 문대통령이 대선 또 나가시는 것도 아닌데 왜 no moon yes lee래? 병신도 저런 병신 드물어.
RT @Tenenbris: Once in a blue moon I decide to draw canon horses again. Inspired by this pic:
@williamsryan021 @ChinChrists @Xyz12557677 @stoolpresidente Right listen carefully $GME to the moon
RT @sofiiaalvees: the moon is beautiful isn’t it
@Fox__moon As duas boiolinha pqp
@Sweet_moon_150 @CNT0THEBLUE logo, ela tinha mais certeza ainda de que era a farda nazista???
RT @omystephanie: I still think about getting the famous gundam wing x sailor moon art tattooed
RT @misconc3ption: taemin trying to explain their own schedule they already finished to the rest of shinee
#PNT IS A SCAM #dogecoin TO THE MOON!!! #ElonMusk
RT @dongilsky: 태일팬자격내려놓겠습니다. 나...이사람 푸쉬업하면서 박수같은건 못 칠거라는 편견에 똘똘뭉쳐잇었어 문태일 그이는 수백번찢기고 다시붙어 질기고도 유연한 근육의 소유자였어 남편라이팅이 이렇게 심각하다
RT @OneLuckyGirl_28: No matter what your Sun sign is—your Moon sign is what rules your love and romance.
@myuati_bab_moon (^_^)/おはよー
@Moon_light_nn سنه واحده وبعدها يفكر
I know I'm late. #NW Over the Moon.
@darkneila ???? Me imagino a vosotros en coro, diciendo bueno me toca con el, luego voy con ella y así todo el rato ajaja
@sophcastilIo my bf is a cancer moon LMAO
whenever the East Coast gets a foot of snow it is a news event somewhere between the Moon landing and the fall of the Soviet Union
What a view! With the Earth below and the Moon visible in the distance, @AstroVicGlover prepares to climb aboard th…
@mickey_d0728 🤪🤪🤪
its always wonwoo talking about the moon. when will the moon talk about WONWOO
در سال های حساس انقلاب، در کوچه پس کوچه های طهران ، حیاط خیلی از خانه ها پرستاران پشت جبهه را پرورش داد. #فرهنگ_اهل_بیت #انقلاب_مردم
RT @my_sunshine10: (Pre) album (เก็บ2รอบ) - NCT 2018 EMPATHY 480 - The First 300 - We Boom 390 - We Go Up 390 - We Young 390 - Reload 480 -…
RT @zikkai: 🪞2月の絵画モクテル🪞 バルテュス「Les Beaux Jours~美しい日々~」 アブサン薫るティーロワイヤルと、バルテュスを読み解く鍵となる”鏡”を模した自家製ダックワーズ。 さっくりと優しい食感のダックワーズには、彼の好物である蜂蜜を使用したバタ…
RT @animeoffcbox: Bishoujo Senshi Sailor Moon
RT @8djxiao8: 슴스토어에도 시퀄 풀렸어요! WayV The 2nd Mini Album Sequel - Take Over The Moon
OMG Moon Gang Tae & Ms Ko 🥺
RT @ffanisuke: 키우던 새싹 언약식 컨셉 앙스타라서 급하게 교복맞춰입음
RT @GlideChamp: 🔫] GenshinTwt can I have your attention for a while? I'm doing a Giveaway of : - 10x welkin moon - 3x [ 6.480 ] genesis…
RT @tinkswonu: the last sentence of wonwoo's poem? essay?? is "today too, i hope the moon is shining brightly" 😭😭😭
RT @_ChohannZ_: อูซอกปูเรื่องตารางหมากรุกมาตั้งแต่ Red moonแล้วนะเราว่า เรื่องราวของRed moon กับ Tasty มันต่อกันนะ อีอย่างในRedmoonมันแบ่ง…
@brioche_aulard もっさんの死
RT @TheOtaking: Sailor Moon - Toei Animation - 1992/1997
RT @katealbus: Tomorrow. My heart is full. ♥️🌙
vai sim, anjo.
@mary033_moon مو كثير لكن قولي كم فيصل 😂😂😂😂
Potato-looking Martian moon Phobos may hold clues to Mars’ ancient past in its soil, new research shows:…
What's up in the sky this February? Find Mars all month after sunset, especially the night of our @NASAPersevere r…
On my way to work and saw this beautiful site. AMC and the Moon. - Courtesy of /u/ aphexflip
And all I see is you..... #Moon #JIN #BTS
We go To The Moon Buy DOGE on BLOX @weareblox USE THIS CODE: EB99-CAE6-8E7D for $10,- free money!! #blox #doge…
RT @leslie_michua: let’s get $DOGE to the fucking moon! let’s also get dogecoin trending #1 on Twitter! we are not fucking leaving!! 🚀 #do…
@imhtaey Estando "bien" como 1 mes
@Vater_Staat @amwill9 oh....dann ist es ja noch nicht zu spät. Happy Birthday, ich wünsch Dir Glück, Zufrieden- und Gesundheit.
RT @veinxd: if you miss me look at the moon
RT @minminiminie: sun for morning🌕 moon for night🌙
RT @CantabileXox: @vanillemercure Mrigashira asc, mula sun, Ardra moon and Swati Venus, i don't think i can pick between the three aestheti…
i am the best daughter and sister ever my mom and sister wnet out to do laundry and because i fixed my led lights l…
@aquariuslite @s pisces sun and moon babbyyy
@cara_o0 ほんとに埋めつくしたい😭
RT @GameStopGME: JUST💎💎💎💎💎💎💎💎 HOLD💎💎💎💎💎💎💎💎 $GME! 💎💎💎💎💎💎💎💎 To the moon 🚀🚀🚀🚀🚀🚀🚀
RT @k1ssthemoon: not too late to be cats in love while singing to the moon
RT @softblushs: “If the moon smiled, she would resemble you. You leave the same impression of something beautiful, but annihilating…” — The…
ok since i promised i’ll do a genshin giveaway once i get xiao, here it is!! -i’ll be giving away 1 welkin moon -r…
RT @AuthorAmps: SAILOR MOON+MAYA & THE RISING DARK Superheroes are supposed to be brave, but after 13yo Catalina gets superpowers at summer…
RT @iDjsSofia: Roier aestethic... the sun and the moon is not the only thing that illuminates, but also you being the light of my life xd ❤…
[UCC] 'Moon' by BTS's Jin is the most-liked and longest-charting solo song of overall 2020 boy group solo songs on…
RT @Cinnaboa: @Moon_woman الحظ والقمر كلٌ له نور مختلف في حياتنا جميلة حروفك ياجميله
@Moon_of_my_lif @m_joka_ Ahem Céline silence.
baixei 2 temporadas de sailor moon pra passar o final de semana inteiro assistindo
RT @VidTuesday: I'm over the moon for this commission by @LuceZozzerie, an intimate scene of letting a wereshark's keen senses enjoy the ro…
@RickySpringfeld @FrommHason @CNN Based on my twitter? And also, taking a confederate flag off a bumper plate isn't…
5 February 1971. 09.18.11 UTC/GMT. Mission Commander Alan Shepard and Lunar Module Pilot Edgar Mitchell aboard Apol…
RT @jeff_foust: Firefly Aerospace announces it’s won a $93.3M NASA Commercial Lunar Payload Services (CLPS) award to carry 10 NASA payloads…
@zelenialoki pacientemente esperando 😌
RT @asimicreations: These blue celestial earrings are named after the the Olympian Goddess, Artemis. She was the Greek Goddess of the hunt,…
RT @cara_monica: We broke .05 again BEFORE the pump! TOO THE MOON WE GO #dogearmy 🚀🚀🚀🚀💎🙌🏻💎🙌🏻 $Doge #DogecoinToTheMoon #DogeToAdollar #dogec…
@planetmari_ My moon being in the 7th this how yall libra moons feel? Like relationships are fundamenta…
RT @ngadventure: A gateway to national parks, Moab draws ‘moon walkers,’ stargazers, and nature lovers.
NASA Selects Firefly Aerospace for Artemis Commercial Moon Delivery in 2023 via NASA
RT @Merryweatherey: That’s not the moon.
RT @sunsetlely: vegetta peleando con siri es lo mejor que van a ver en sus vidas
@ronahi_mihemed Kîlometre zero Half moon Girls of the sun
RT @PunjabiKush: It’s been almost a week of me Dealing with #COVID19 I’m so ready for this flu crap to go away!
밸런타인데이에는 치키치키차카차카초코초코문타르트를~ | ✨금손 문선생의 최고의 요리비결✨ | Master MOON Chef #NCT #금손문선생​ #TAEIL​…
バレンタインにはチキチキチャカチャカチョコチョコムンタルトを~ | ✨ゴールドハンド ムン先生の最高の料理秘訣✨ | Master MOON Chef #NCT #금손문선생​…
RT @samanthavamp1: Full moon tonight 😝 and some music!!!
RT @minpark66: 갱상도 말로 한마디만 하꾸마. 지발 니 그 주디 좀 쳐 다물고 앞으로는 절때로 씨부리지 마래이. 알았나? 동네서 길가다 만났시마 니는 내한테 마아주거따 빙시나. 주디 다물고 찌그러져 있으래이.
RT @sebastianm0ren0: “Neon Moon” and “Tennesee Whiskey” will always be a vibe 😩
RT @lunarclaws: - ☀️ Sun & Moon 🌘 -
@Simplyyyycee falseeee. i have a cancer sun, gemini moon, and a scorpio rising and i’m the most spontaneous person you’ll never meet
I want to dance to Neon Moon with someone
Law Decoded: New dawn or bad moon rising for trust-busting in tech, Jan. 29–Feb. 5 -
RT @NCTsmtown: 밸런타인데이에는 치키치키차카차카초코초코문타르트를~ | ✨금손 문선생의 최고의 요리비결✨ | Master MOON Chef #NCT #금손문선생​ #TAEIL​ #JUNGWOO…
RT @sebastianm0ren0: “Neon Moon” and “Tennesee Whiskey” will always be a vibe 😩
RT @heycutelouie: Harry podría convertirse en el primer artista masculino con todas sus canciones por arriba de 100M de streams en Spotify,…
@moon_ladob Comida, algo el partido y The weekend 👌🏽
RT @sebastianm0ren0: “Neon Moon” and “Tennesee Whiskey” will always be a vibe 😩
RT @DogeWillWin: Please retweet this message to our fellow brothers and sisters. #doge #dogecoin #dogearmy #dogecoinarmy We will not back d…
@venusretrogayde the pisces moon is tooooo accurate lmao (also is that msi playing???)
RT @daystar_19: "مربكة فكرة الحب، فكرة ان تقسم روحك ولا تضمن عودتها لك مرةً اُخرى."
Make some noise for the moon
Yesterday was the first New Moon after January 21. And so Happy New Year to the zillion people of Planet Earth who…
If Coco the Clown MP wrote a Daily Telegraph column explaining his conviction that the moon is made of marmalade, t…
WARNING: Extreme Awesomeness and Flashing Lights! Bruh! Keith Moon!!! Unreal! This one is for you Mooney! One of th…
RT @lowkeyalbert: i'm such a "look at the moon" type of person
@moon__522 👋🙇🏻‍♂️🤛 손절치기
my sidereal sag moon
RT @bptmix: ย้อนกลับไปเพื่อสร้างความทรงจำเอาไว้ และสุดท้ายก้อต้องจากมา ไม่สามารถอยู่ดูแลเค้าและไม่สามารถมีเค้าในปัจจุบันได้ เป็นตอบจบที่ทำใ…
And if the bed represents about dreams and the connection of the moon itself to Ateez- Crescent Moon halateez or…
RT @TostevinM: US embassy in Myanmar reports 'military movements' in Yangon, warns of telecommunications interruptions overnight #WhatsHapp…
RT @Boii_McCoy: She’s the union of the sun and the moon in human form.
miyukipalet Moon
RT @GivemebackMONEY: 따따(@DDA_0409)님이 여태 하신 일들의 정리본입니다. 첨부된 이미지에 있는 내용들이 정리되어있으며, 추가 제보는 #따따님_돈_돌려주세요 해시태그를 통해 확인 가능합니다. 내스급 박예림 여름패키지 포함 예림…
@hynskbln mari kita tos moon ✋
RT @sly3if: hi everyone (〃▽〃)! in honor of xiao coming home i decided to do a welkin moon giveaway <33 rt/like to enter,,, u dont need to f…
@Moon_Splatoon2 ハピバー!!🎂🎉✨
RT @sincerelyart: La Luna En Paraiso / The Moon In Paradise a tribute to Salvador Dali
@komutan1207 私も歴浅いです🤭仲良くしましょう💕 よかったら気軽に敬語なしで絡んでもらえたら🥰もんちゃんって呼んでください✨
RT @taeilbabiie: MOON TAEIL
@Pizza_fajita 😆
i LOVE when people perfectly nail gifts because they pay attention to what you actually like, with sentiment behind…
Where ever you go, I’ll go, cause we’re in it together. For better or worse, hold on, cause it only gets better. 🎵…
@unrae_moon 그아아아아아아아아아악귀여워.......!!!!!!! 넘 귀엽워서 테린느치우고 오너가 난입해버리는
RT @allmymemoryyy: ชราไลน์กับวาเลนไทน์น่ะหรอ ..
RT @PhenixSelevant: I chose the moon in you to match the sun in me.
엽떡 착한 맛에서 한 단계 높은 게 머지
RT @B_hundred_Hyun: @fi_fi_fi_fi_fi_ 이미 많이먹어찌...
RT @lowkeyalbert: i'm such a "look at the moon" type of person
RT @essenceofgaiaa: the moon says happy valentine’s day 🌹
Kalo ada yang punya PC Sowon era Time For The Moon Night / Time For Us mau yaa... DM aja. Murce kalo bisa Gfriend…
今日、学校でGOT7流れました!!! 曲名は「NOT BY MOON」です!
RT @exo_territory: EXO Actors Are Coming 😍 #LAY >> Crime Crackdown #CHANYEOL >> The Box #Kyungsoo >> The Moon >> The unspeakable…
…だからさぁ。 #Peing #質問箱
RT @Stars_love_moon: #친해지고_싶다_rt_안아주고_싶다_마음_우린_짱친_멘션_얘는_내_거야_인용_사랑해_디엠 자기들아
RT @B_hundred_Hyun: @BH920506B 응?... .조합무엇?....
Route 4 is at the foot of MT.MOON.
RT @OnlyPrivDA: Todo el staff de OnlyPriv les deseamos un feliz San Valentín a todos. 🥰 Les dejamos este videito de nuestra bebé Moon, #xLi…
Modern Mysticism Art Print Clouds Celestial Lunar Artwork | Etsy
Moon Phases Set Of Five Made To Order. Moon Phases Art | Etsy
Reflection of the moon on the ocean #oceanmoon #fullmoon #nightocean #sea
NEW! Moon Phases poster wall art!💕 ☾A guide to the lunar cycle- what each of the moon phases are called, what they indicate, and how to be most aligned with them. ☾ This is an original piece. ☾ The moon phases are original picture taken from NASA! ☾ Moon phases are tracked for many reasons - they're great for goal setting, cycle tracking, spiritual uses, and of course - looking at the stars! ☽ Never miss the perfect lunar phase for your spells again!
Asian circle set with clouds, moon, sun,... | Free Vector #Freepik #freevector #gold #circle #ornament #line
Moon Goddess – Cocorrina & Co Lt #moon Goddess – Cocorrina & Co Ltd
Modern Mysticism Art Print Clouds Celestial Lunar Artwork | Etsy
Under The Same Stars And Moon
At the waning crescent moon—or balsamic moon—it's time to fully surrender and let go. This is a period of rest, quiet, and most importantly, peace. Relax your mind through meditation and prepare for the new cycle to come.Image via Pinterest
Do your emotions give off a "Full Moon Vibe" or maybe a "Last Quarter Feel?"
Asian circle set with clouds, moon, sun,... | Premium Vector #Freepik #vector #gold #circle #ornament #line
50,000 Photographs Combine to Form a Detailed Image of the Moon and Stars | Colossal
Spirituality Shop
123RF - Des millions de photos, vecteurs, vidéos et fichiers musicaux créatifs pour votre inspiration et vos projets.
Moon Goddess – Cocorrina & Co Lt #moon Goddess – Cocorrina & Co Ltd
moon Pinterest Ideas
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Jul 19, 2020 21:56
Pierwszy test nowości z @maccosmeticspoland z kolekcji Powder Kiss za mną! Zakochałam się w tej formule totalnie 💖 pomadki mają konsystencję pianki, super kryją i dają efekt soft matu, a nawilżenie utrzymuje się do 10h! Cienie kolei blendują się same, także idealne na szybkie smokey eyes! Podstawowa linia pomadek jak widać swietnie się sprawdza jako róż do policzkó 💖 Użyłam : Face&Body  Studio Fix concealer  Soft&Gentle Skinfinish  24h eye base  So Haute Right Now powderkiss eyeshadow Dual Dare eyeliner  Dazzleshadow liquid In Extreme  Dimension 3d mascara  Eyelashes 76 Mull It Over lipstick jako róż Mull It Over powderkiss liquid lipstick  Od @maccosmeticspoland @maccosmetics @mac.galeriakrakowska #tutorial #makeup #maccosmetics #maccrew #macartist #myartistcommunity #makeuptutorial #macartistpoland #tattooedgirl #tattoo #piercing #nosepiercing #foxyeyes #eyebrows #freckle #foxeyes #macyesshare #theartistedit #muaawesome #macpowderkiss #macpowderkissliquidlipcolour #jewellery #eyelashes #eyeliner #moon #witch #stars #greyhair #handtattoo #glitter
#handtattoo #macyesshare #witch #eyebrows #eyelashes
Jul 19, 2020 21:56
Les vacances à trouville . . . . . . . . #photography #trouville #photographer #instapic #bycicle #moon #street #streetart #picoftheday #mycity #slowlife #velo
#photography #bycicle #streetart #trouville #picoftheday
Jul 19, 2020 21:56
🍀 . . . . . #JustGoShoot #mountain #sky #dark #palermo #Photogram #Capture #PhotographyDaily #PhotographyIsLife #iPhoneography #Camera #Composition #Photoshop #Instadaily #Igers #Cityscape #sea #moon #Instafocus #IGworldclub #Visuals #Aesthetics #ThroughTheLens #Snapshot #Exposure #Moment #PhotographyAddict #people
#photographyaddict #igers #justgoshoot #photogram #iphoneography
Jul 19, 2020 21:56
Chand ki tarha hai vo, kabhi kabhi hi dikhti hai. #moon #night #latenight #single #nightwalk #idk
#latenight #nightwalk #moon #single #idk
Jul 19, 2020 21:56
I Δм τΟΟ βυςΥ wΟRKIПG ΟП мΥ ΟwП GRΔςς τΟ ПΟτIζΣ IF ΥΟυRς Iς GRΣΣПΣR.. 😎#mindingmyownbusiness • • • 😴 #exhausted #toptags #nightynight #star #moon #sleeptime #instagooddeepsleep #broken #bed #kisses #partylightsout #stars #drained #right #afterparty #alcohol #donotwant #gn #warm #tired #beautiful #photooftheday #blanket #beds #love #dark #night #goodnight #inthemood #exhausted
#afterparty #broken #toptags #sleeptime #nightynight
Jul 19, 2020 21:56
#balloon #heorshewhatwillitbe#pink#blue#moon#star
#blue #moon #pink #star #balloon
Jul 19, 2020 21:56
Solar system ☀️🪐 #solarsystem #sun #planet #moon #dots #tattoolover #tattoo #tattooartist #tattooart #draw #drawing #pencildrawing #pen #fabercastell #sketchbook #art #artlovers #artist #artistsoninstagram #blackandwhite #tattooidea #inktattoo #ink
#tattooartist #tattooidea #tattoolover #planet #sketchbook
Jul 19, 2020 21:56
#3dworkbaku #3dprinted #3dprinter #3Ddesign #3dmodeling #3dprinting #makerbot #aneta10 #tevo #tronxyx5s #litophane #moon #moonlitophane #litophanemaker
#tronxyx5s #aneta10 #3dworkbaku #3dprinting #3dmodeling
Jul 19, 2020 21:56
📸 @amybethweeks DM a photo to @uncover_wisconsin for a feature, tag or #uncover_wisconsin for a like! • • #wisconsin #greatlakes #greenbay #milwaukee #madison #doorcounty #midwest #wisconsinphotography #discoverwisconsin #travelwisconsin #explorewisconsin • • #travel #nature #farm #moon #sunset #hiking #outdoors #camping #cabin #local #adventure #trees #forest • • #canon #nikon #photography #photo #photooftheday
#travelwisconsin #photography #forest #hiking #midwest
Jul 19, 2020 21:56
NEW! “La Luna Tarot Card” tees, hoodies, stickers, and tapestries! Store link in bio. Every sale helps and independent artist!🖤 . . . #teepublic #teepublicshirts #teepublicartist #goth #skateboard #skateboarding #black #white #darkart #gothic #grunge #sad #selfaware #sepfawaredesigns #tarotcard #tarotdeck #witch #witchcraft #moon #weedart #marijuana #cannabis #420 #710 #weed #pot
#710 #sepfawaredesigns #grunge #white #cannabis