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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 ]
Pages in category "Leap years in the Gregorian calendar" The following 110 pages are in this category, out of 110 total. This list may not reflect recent changes .
Lists of years or Tables of years are indexes that list all of the individual timelines by year that pertain to a specific topic. Timespans next to the timeline articles listed here include the date of the earliest item included in the linked timeline article.
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
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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).
Each year, the Gregorian calendar is approximately 0.24 days faster than the astronomical calendar, which is corrected by a leap day once every four years. This 4-year cycle is clearly visible in the graph.
Any leap year that starts on Saturday has only one Tuesday the 13th: the only one in this leap year occurs in June. Any leap year that starts on Saturday has two Friday the 17ths: those two in this leap year occur in March and November. This is the only type of year in which all dates (except 29 February) fall on their respective weekdays the ...