 | 1 Leap Years = 366 Days
To be a leap year, the year number must be divisible by four except for end-of-century years, which must be divisible by 400. A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added to keep the calendar year synchronized with the astronomical year or seasonal year. |
  
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