Moon phase/en

Moon phase

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Moon-phase display
Caliber A. Lange und Söhne L922.1

Himmelsscheibe von Nebra

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

Sea also: Moon-phase display