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Last updated on April 16, 2014 at 17:34 EDT

Blue moon Reference Libraries

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Lunar Phase
2004-10-19 04:45:41

Lunar Phase -- The lunar phase is an astronomical term referring to the portion of the Moon that is visibly illuminated by the Sun, as seen from Earth. As the Moon orbits the Earth, the relative positions of the Sun, Earth and Moon change. Since the Moon only appears bright due to the Sun's reflected light, only the half of the Moon closest to the Sun is illuminated. Lunar phases are...