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Once every 27 days. You would think that it would be 29.5 days, because that's how long it is from full moon to full moon, but it's 27 days. The extra 2.5 days is because the Earth travels along in its orbit around the Sun while the Moon is going around the Earth, and it takes the Moon an additional 2.5 days to "catch up" to be in the same relative position.

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14y ago

What else can I help you with?