Question

why there is 29 days in february in a lep year??

Answer 1

A leap year , where an extra dayis added to the end of February every four years, is down to the Gregorian calendar's disparity with the solar system. A complete orbit of the earth around the sun takes exactly 365.2422 days to complete, but the Gregorian calendar uses 365 days.

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Answer 2

because each year has 365days and 6 hours
these six hours add up to get 24hrson every four years ,forming an extr a day