The Earth's moon. Galileo observed the moon through a telescope and thought that the dark areas were seas. This is why some areas of the Moon are named as seas.
| A view of the Apollo 11 lunar module "Eagle" as it returned from the surface of the moon to dock with the command module "Columbia". 21 July 1969 |
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| Mass|| 7.3483E+22|| kg||Clip|
| Equatorial diameter|| 3474800|| m||Clip|
| Mean orbital radius|| 384400000|| m||Clip|
| Orbital period|| 27.32166d|| y=Earth year, d=Earth day||Clip|
| Gravity at equator|| 1.62|| ms-2||Clip|
| Mean orbital velocity|| 1030|| ms-1||Clip|
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- Waning Moon
- The moon between full and new when its visible part is decreasing.
- 470BC Anaxagoras suggests that the Sun, Moon and stars are composed from the same matter as Earth.
- 450BC Anaxagoras proposes that the Moon shines with the light of the Sun and from this was able to explain the eclipses.
- 330BC Pytheas proposed that tides are caused by the Moon.
- 1504 Christopher Columbus correctly predicts the total eclipse of the moon.
- 1964 Unmanned U.S. spacecraft transmitted television pictures of the moon before hitting the surface.
- 1966 The first unmanned soft landing on the moon (Soviet Union).
- 1968 First manned flight around the moon is made by Frank Borman, James Lovell and William Anders in Apollo 8.
- 1969 Apollo 11 crew make the first human landing on the moon. Neil Armstrong steps on the moon.
- 1972 Eugene Cernan and Jack Schmitt in Appolo 17 are the last to land on the Moon.
See also: Earth, Earthlight, Halo, Lunar Gravity, Metonic Calendar, Pericynthian, Selenoid, Selenology, Sun.
Subjects: Astronomy Physics
- NASA Photographic Library Photographs from NASA available for viewing and download.
- Phases of the Moon US Naval Observatory Astronomical Applications Department.
- Apollo Image Archive A digital archive of all the original Apollo flight films.
- The Nine Planets A Multimedia Tour of the Solar System: one star, eight planets, and more.