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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) 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 . [ 1 ]
Formula. The template currently uses Wikimedia function time (#time). It is the same as if 4 mod year = 0 and 100 mod year ≠ 0, then not a leap year, unless 400 mod ...
A year is only a leap year if it is evenly divisible by four, and "if the year can be evenly divided by 100, it is not a leap year unless the year is also evenly divisible by 400," according to ...
A year may be a leap year if it is evenly divisible by 4. Years divisible by 100 (century years such as 1900 or 2000) cannot be leap years unless they are also divisible by 400. (For this reason ...
As mentioned, leap years typically take place every four years. That means the next leap years coming up after 2024 are 2028, 2032, 2036, 2040, 2044 and 2048. But again, it's not quite that easy.
With 97 leap years every 400 years, the Gregorian calendar year has an average length of 365.2425 days. Other formula-based calendars can have lengths which are further out of step with the solar cycle: for example, the Julian calendar has an average length of 365.25 days, and the Hebrew calendar has an average length of 365.2468 days. The ...
On a non-Leap Year, some leapers choose to celebrate the big day on Feb. 28. Some choose to celebrate on March 1. Some even choose both days or claim the whole month of February to celebrate.
Like all leap year types, the one starting with 1 January on a Sunday occurs exactly once in a 28-year cycle in the Julian calendar, i.e., in 3.57% of years. As the Julian calendar repeats after 28 years, it will also repeat after 700 years, i.e., 25 cycles. The formula gives the year's position in the cycle ((year + 8) mod 28) + 1).