Moon Phases

Moon Phases

About Moon Phases

A lunar phase or phase of the moon is the appearance of the illuminated (sunlit) portion of the Moon as seen by an observer, usually on Earth. The lunar phases change cyclically as the Moon orbits the Earth, according to the changing relative positions of the Earth, Moon, and Sun.

Contributions by Lunokhod, Tomruen, and SaberScorpX.