Why there is a leap year after four years?

 LEAP YEAR IS THERE AFTER 4 YEARS BECAUSE EARTH COMPLETE ONE REVOLUATION IN 365 1/4 DAY , IN WHICH 1/4 IS WHEN MULTIPLIED BY 4 IT IS 4/4 =1 .SO THE ONE DAY ADDS ONE MORE DAY TO AN YEAR OF 365 DAYS WHICH LEADS TO A LEAP YEAR OF 366 DAYS.

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