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Just under 40.5 years: It takes an average of 29.53 days for the moon to circle the earth from full moon to full moon or from new moon to new moon, but it can vary by about a day. 29.53 x 500 = 14765 days or about 40 years, five months and a few days, give or take about a couple days depending on the moon and whether it's a leap year or not.

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13y ago

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