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Type of year that has 366 days, instead of 365 for a common year
A leap year is a calendar year that contains an additional day compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. Since astronomical events and seasons do not repeat in a whole number of days, calendars having a constant number of days each year will unavoidably drift over time with respect to the ev... Wikipedia