Question

Why do we have a leap year

Answer 1

A common year has 365 days and aleap year 366 days, with the extra, or intercalary, day designated as February 29. A leap year occurs every four yearsto help synchronize the calendar yearwith the solar year, or the length of time it takes the earth to complete its orbit about the sun, which is about 365¼ days.



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Answer 2

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The simple reason for leap year is that the earth revolves around the sun in approximately 365.25 days, and so to make sure that a calendar year is the same as a tropical year (which is the period of earth's revolution), there needs to be an extra day added every 4 years. But then, even that doesn't make the calendar accurate (the earth doesn't revolve around sun in exactly 365.25 days), so there's another rule that years which are divisible by 100 have to be also divisible by 400 for it to be a leap year.