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It takes about 365.2422 days for Earth to orbit the sun, but the number of days in a calendar year is always a whole number. In the Gregorian calendar, each regular year has 365 days and each leap year has 366 days. There are 97 leap years in every 400-year period. That makes the average length of a Gregorian calendar year 365.2425 days.

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9y ago

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