How long is one cycle of phases?


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Just like any other sphere illuminated by any other flashlight, 50% of the moon's surface is always illuminated by the sun. But because the relative positions are always changing, we see different amounts of the lighted portion from earth. The complete cycle of 'phases' as seen from earth repeats with an average of 29 days, 12 hours, 44 minutes, 02.9 seconds.

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