How Often Does Leap Year Happen?

A leap year is a calendar year that contains an additional day compared to a common year. By adding an extra day every four years, our calendar years stay adjusted. By adding a leap day every four years, we actually make the calendar longer by over 44 minutes. Over time, these extra 44+ minutes would also cause the seasons to drift in our calendar. For this reason, every four years is a leap year.  The rule is that if the year is divisible by 100 and not divisible by 400, the leap year is skipped. The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not.  The next time a leap year will be skipped is the year 2100. 

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