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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 366 60 day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]
The mean tropical year on January 1, 2000, was 365.242 189 7 or 365 ephemeris days, 5 hours, 48 minutes, 45.19 seconds. This changes slowly; an expression suitable for calculating the length of a tropical year in ephemeris days, between 8000 BC and 12000 AD is
{{is leap year|year}} year defaults to {{CURRENTYEAR}} (2025). It must be specified in the Gregorian calendar, extended to all epochs using linear year numbering: use the proleptic Gregorian calendar in Christian Era before the change, and the astronomical year convention (using negative numbers, and year 0) in all years BC before the Christian era (there's a difference of 1 in absolute value).
The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars. For the Gregorian calendar, the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days (97 out of 400 years are leap years ...
A leap year starting on Sunday is any year with 366 days (i.e. it includes 29 February) that begins on Sunday, 1 January, and ends on Monday, 31 December. Its dominical letters hence are AG. The most recent year of such kind was 2012, and the next one will be 2040 in the Gregorian calendar [1] or, likewise 2024 and 2052 in the obsolete Julian ...
A leap year starting on Thursday is any year with 366 days (i.e. it includes 29 February) that begins on Thursday 1 January, and ends on Friday 31 December. Its dominical letters hence are DC . The most recent year of such kind was 2004 , and the next one will be 2032 in the Gregorian calendar [ 1 ] or, likewise, 2016 and 2044 in the obsolete ...
A leap year starting on Tuesday is any year with 366 days (i.e. it includes 29 February) that begins on Tuesday, 1 January, and ends on Wednesday, 31 December. Its dominical letters hence are FE . The most recent year of such kind was 2008 , and the next one will be 2036 in the Gregorian calendar [ 1 ] or, likewise 2020 and 2048 in the obsolete ...
Retrieved from "https://en.wikipedia.org/w/index.php?title=Leap_Year_Day&oldid=546831278"This page was last edited on 25 March 2013, at 01:02 (UTC). (UTC).