A leap year is a calendar year with 366 days instead of the usual 365 days. Every fourth year in the calendar is leap year (or the years which are divisible by 4). This is because the earth takes 365 days, 5 hours, 49 minutes, and 12 seconds approximately to complete one revolution. Since our calendar has only 365 days, the remaining hours accumulate to 1 day every four years and that additional 1 day is added to February. So February has 29 days in the leap year.
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