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To get the same mean year as the Gregorian Calendar this leap week is added to 71 of the 400 years in the cycle. The years with leap week are years whose last two digits are a number that is divisible by six (including 00) or 99: however, if a year number ending in 00 is divisible by 400, then Pax is cancelled.
Sundays on the dates March 22 through April 25 in the Gregorian calendar may be the 81st through 115th day of common years or 82nd through 116th day of leap years. They occur as the last day of ISO week number W12 through W17 and are also the 12th through 17th Sunday of the year, but these numbers mismatch in some years.
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 ]
March 13 is the 72nd day of the year (73rd in leap years) ... 1953 – Michael Curry, ... 2021 – Marvelous Marvin Hagler, ...
With 97 leap years every 400 years, the 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.
Rather than a regular 365-day year, the leap year adds an extra day to “keep the calendar in sync with the seasons”. For a year to be a leap year, it has to be divisible by four or 400.
The table is filled in horizontally, skipping one column for each leap year. This table cycles every 28 years, except in the Gregorian calendar on years that are a multiple of 100 (such as 1800, 1900, and 2100 which are not leap years) that are not also a multiple of 400 (like 2000 which is still a leap year).
In the Gregorian calendar, the standard civil calendar used in most of the world, February 29 is added in each year that is an integer multiple of four, unless it is evenly divisible by 100 but not by 400. For example, 1900 was not a leap year, but 2000 was. The Julian calendar—since 1923 a liturgical calendar—has a February 29 every fourth ...