Why do we have leap years
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We have leap years to keep the calendar accurate with respect to the solar year. It takes the Earth 365 days, 5 hours, 48 minutes, and 46 seconds—just under 365.25 days—to revolve around the sun. If there were no leap years, every 56 years the calendar would be two weeks behind. By adding one extra day every four years, the calendar stays accurate.