Moon phases

Definition (http://en.wikipedia.org/wiki/Moon_phases)

Lunar phase or phase of the moon refers to the shape 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. (Wikipedia)

Preferred Units: N/A

Scope Note:
N/A

This term is used for the following terms: 
Lunar cycle
Lunar phases

Approved Date
12-Aug-2013

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