Position and appearance
The Moon's highest altitude at culmination varies by its lunar phase, or more correctly its orbital position, and time of the year, or more correctly the position of the Earth's axis. The full moon is highest in the sky during winter and lowest during summer (for each hemisphere respectively), with its altitude changing towards dark moon to the opposite.
At the North and South Poles the Moon is 24 hours above the horizon for two weeks every tropical month (about 27.3 days), comparable to the polar day of the tropical year. Zooplankton in the Arctic use moonlight when the Sun is below the horizon for months on end.[198]
The apparent orientation of the Moon depends on its position in the sky and the hemisphere of the Earth from which it is being viewed. In the northern hemisphere it appears upside down compared to the view from the southern hemisphere.[199] Sometimes the "horns" of a crescent moon appear to be pointing more upwards than sideways. This phenomenon is called a wet moon and occurs more frequently in the tropics.[200]
The distance between the Moon and Earth varies from around 356,400 km (221,500 mi) (perigee) to 406,700 km (252,700 mi) (apogee), making the Moon's distance and apparent size fluctuate up to 14%.[201][202] On average the Moon's angular diameter is about 0.52°, roughly the same apparent size as the Sun (see § Eclipses). In addition, a purely psychological effect, known as the Moon illusion, makes the Moon appear larger when close to the horizon.[203]
The tidally locked synchronous rotation of the Moon as it orbits the Earth results in it always keeping nearly the same face turned towards the planet. 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 dark moon to new moon, the near side is dark.[204]
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.[205] 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.[206]
Mid-Autumn Festival Stories
There are many legends about Mid-Autumn Festival. The most popular stories are about Chang'e and the Jade Rabbit.
Want to share the Mid-Autumn Festival story with your family? The 3-minute video below will show you all about it.
The origin of the Mid-Autumn Festival is associated with the popular legend of Chang'e (嫦娥), the goddess of the moon, and Hou Yi, the husband of Chang'e. He was rewarded with an elixir of immortality by the Queen Mother when he shot down nine of the ten suns and saved people from their smoldering heat. In Chinese folklore, he did not drink it straight away because he did not want to gain immortality without his wife. So, he asked Chang'e to keep it safe for him.
Unexpectedly one mid-autumn day, while Houyi was out hunting, an evil person tried to force Chang'e to hand over the elixir. Chang'e swallowed the elixir however and flew higher and higher. She then chose the moon as her immortal abode, to be close to her beloved husband and look down on him on Earth. Hou Yi was very sad and made sacrifices to Chang'e with incense, cakes, and fruits.
Legend has it that there is a rabbit companion with Chang'e on the moon, white as jade, so it is called 'jade rabbit'. As time passed, the jade rabbit became synonymous with the moon in Chinese culture.
The custom of worshiping the moon on Mid-Autumn day has been passed down from generation to generation.
Enjoying a Dinner with Family
The roundness of the moon represents the reunion of the family in Chinese minds. Families will have dinner together on the evening of Mid-Autumn Festival.
The public holiday (usually 3 days) is mainly for Chinese people working in different places to have enough time to reunite. Those staying too far away from their parents' home usually get together with friends.
Mooncakes are the must-eat Mid-Autumn food in China. They are a traditional Chinese pastry. Their round shape and sweet flavor symbolize completeness and sweetness.
At the Mid-Autumn Festival, people eat mooncakes together with family, or present mooncakes to relatives or friends, to express their love and best wishes. Mooncakes are usually eaten after dinner while admiring the moon.
Other Mid-Autumn Festival Food:
Celebrating the harvest is one of the most traditional meanings of Mid-Autumn Festival, thus harvest foods are favored during the festive period, such as crabs, pumpkins, pomelos, and grapes. People enjoy them at their freshest, most nutritious time, and enjoy their auspicious meanings that are particularly associated with round foods.
Click to know Mooncakes — Symbols, Flavors, Regional Varieties, and How to Eat Mooncakes.
Astronomy from the Moon
The Moon has been used as a site for astronomical and Earth observations. The Earth appears in the Moon's sky with an apparent size of 1° 48′ to 2°,[293] three to four times the size of the Moon or Sun in Earth's sky, or about the apparent width of two little fingers at an arm's length away. Observations from the Moon started as early as 1966 with the first images of Earth from the Moon, taken by Lunar Orbiter 1. Of particular cultural significance is the 1968 photograph called Earthrise, taken by Bill Anders of Apollo 8 in 1968. In April 1972 the Apollo 16 mission set up the first dedicated telescope,[294][295] the Far Ultraviolet Camera/Spectrograph, recording various astronomical photos and spectra.[296]
The Moon is recognized as an excellent site for telescopes.[297] It is relatively nearby; certain craters near the poles are permanently dark and cold and especially useful for infrared telescopes; and radio telescopes on the far side would be shielded from the radio chatter of Earth.[298] 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.[299] A lunar zenith telescope can be made cheaply with an ionic liquid.[300]
The only instances of humans living on the Moon have taken place in an Apollo Lunar Module for several days at a time (for example, during the Apollo 17 mission).[301] One challenge to astronauts during their stay on the surface is that lunar dust sticks to their suits and is carried into their quarters. Astronauts could taste and smell the dust, which smells like gunpowder and was called the "Apollo aroma".[302] This fine lunar dust can cause health issues.[302]
In 2019, at least one plant seed sprouted in an experiment on the Chang'e 4 lander. It was carried from Earth along with other small life in its Lunar Micro Ecosystem.[303]
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.[304] Likewise no private ownership of parts of the Moon, or as a whole, is considered credible.[305][306][307]
The 1967 Outer Space Treaty defines the Moon and all outer space as the "province of all mankind".[304] It restricts the use of the Moon to peaceful purposes, explicitly banning military installations and weapons of mass destruction.[308] A majority of countries are parties of this treaty.[309] The 1979 Moon Agreement was created to elaborate, and restrict the exploitation of the Moon's resources by any single nation, leaving it to a yet unspecified international regulatory regime.[310] As of January 2020, it has been signed and ratified by 18 nations,[311] none of which have human spaceflight capabilities.
Since 2020, countries have joined the U.S. in their Artemis Accords, which are challenging the treaty. The U.S. has furthermore emphasized in a presidential executive order ("Encouraging International Support for the Recovery and Use of Space Resources.") 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."[312][313]
With Australia signing and ratifying both the Moon Treaty in 1986 as well as the Artemis Accords in 2020, there has been a discussion if they can be harmonized.[266] In this light an Implementation Agreement for the Moon Treaty has been advocated for, as a way to compensate for the shortcomings of the Moon Treaty and to harmonize it with other laws and agreements such as the Artemis Accords, allowing it to be more widely accepted.[265][267]
In the face of such increasing commercial and national interest, particularly prospecting territories, U.S. lawmakers have introduced in late 2020 specific regulation for the conservation of historic landing sites[314] and interest groups have argued for making such sites World Heritage Sites[315] and zones of scientific value protected zones, all of which add to the legal availability and territorialization of the Moon.[285]
In 2021, the Declaration of the Rights of the Moon[316] was created by a group of "lawyers, space archaeologists and concerned citizens", drawing on precedents in the Rights of Nature movement and the concept of legal personality for non-human entities in space.[317][318]
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First missions to the Moon (1959–1976)
After World War II the first launch systems were developed and by the end of the 1950s they reached capabilities that allowed the Soviet Union and the United States to launch spacecraft into space. The Cold War fueled a closely followed development of launch systems by the two states, resulting in the so-called Space Race and its later phase the Moon Race, accelerating efforts and interest in exploration of the Moon.
After the first spaceflight of Sputnik 1 in 1957 during International Geophysical Year the spacecraft of the Soviet Union's Luna program were the first to accomplish a number of goals. Following three unnamed failed missions in 1958,[244] the first human-made object Luna 1 escaped Earth's gravity and passed near the Moon in 1959. Later that year the first human-made object Luna 2 reached the Moon's surface by intentionally impacting. By the end of the year Luna 3 reached as the first human-made object the normally occluded far side of the Moon, taking the first photographs of it. The first spacecraft to perform a successful lunar soft landing was Luna 9 and the first vehicle to orbit the Moon was Luna 10, both in 1966.[72]
Following President John F. Kennedy's 1961 commitment to a crewed 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, the Lunar Orbiter program and the Surveyor program. 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 first Earthlings, two tortoises, had circled the Moon three months earlier on the Soviet Union's Zond 5, followed by turtles on Zond 6).
The first time a person landed on the Moon and any extraterrestrial body was when Neil Armstrong, the commander of the American mission Apollo 11, set foot on the Moon at 02:56 UTC on July 21, 1969.[245] Considered the culmination of the Space Race,[246] 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.[247][248] While at the same time another mission, the robotic sample return mission Luna 15 by the Soviet Union had been in orbit around the Moon, becoming together with Apollo 11 the first ever case of two extraterrestrial missions being conducted at the same 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.[249] 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,[250][251] but as the stations' lunar laser ranging corner-cube retroreflector arrays are passive instruments, they are still being used.[252] Apollo 17 in 1972 remains the last crewed mission to the Moon. Explorer 49 in 1973 was the last dedicated U.S. probe to the Moon until the 1990s.
The Soviet Union continued sending robotic missions to the Moon until 1976, deploying in 1970 with Luna 17 the first remote controlled rover Lunokhod 1 on an extraterrestrial surface, and collecting and returning 0.3 kg of rock and soil samples with three Luna sample return missions (Luna 16 in 1970, Luna 20 in 1972, and Luna 24 in 1976).[253]
