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the time taken in a complete revolution is 365 years and 6 hours. we know a single year have 365 days. then in every year the extra 6 hours of revolution left. in four year the total number of left hour is 24 (6*4=24 hours). so, in every four we get one extra day. this extra day added to the month of february. thats why february becomes of 29 days and the that year become of 366 days and that year is known as leap year.
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Rabi
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