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The Moon orbits around the Earth in 27.3 days and its position relative to the Sun changes constantly. Therefore, on Earth we see an ever changing part of its illuminated half resulting in the well known lunar phases: new moon, waxing moon, full moon, waning moon and back to new moon. Because the Earth moves around the Sun at the same time, the full cycle takes 29.5 days to complete.

CREDIT: Lightcurve Films.

Source:
http://www.lightcurvefilms.com