Leap year - Which day is the leap day?

The Gregorian calendar, the current standard calendar in most of the world, adds a 29th day to February in all years evenly divisible by 4, except for century years (those ending in -00), which receive the extra day only if they are evenly divisible by 400. Thus 1996 was a leap year whereas 1999 was not, and 1600, 2000 and 2400 are leap years but 1700, 1800, 1900 and 2100 are not. The reasoning behind this rule is as follows: The Gregorian calendar is designed to keep the vernal equinox on or close to March 21, so that th ...

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There is a tradition, said to go back to Saint Patrick and Saint Bridget in 5th century Ireland, whereby women may only make marriage proposals in leap years. Leap year - Saint Patrick and the leap year. Saint Patrick, having driven the frogs out of the bogs was walking along the shores of Lough Neagh, when he was accosted by Saint Bridget in tears, and was told that a mutiny had broken out in the nunnery over which she presided, the ladies claiming the right of proposing for marriage.

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Leap year, Leap year - Gregorian calendar, Leap year - Which day is the leap day?, Leap year - Julian calendar, Leap year - Revised Julian Calendar, Leap year - Chinese calendar, Leap year - Hebrew calendar, Leap year - Hindu Calendar, Leap year - Iranian calendar, Leap year - Long term leap year rules, Leap year - Marriage proposal, Leap year - Saint Patrick and the leap year, Leap year - Birthdays

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A person who was born on 29 February may be called a "leapling". In non-leap years they usually celebrate their birthday on 28 February or 1 March. There are many instances in children's literature where a person's claim to be only a quarter of their actual age turns out be based on counting their leap-year birthdays. A similar device is used in the plot of the Gilbert and Sullivan operetta The Pirates of Penzance. ...

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Leap year, Leap year - Gregorian calendar, Leap year - Which day is the leap day?, Leap year - Julian calendar, Leap year - Revised Julian Calendar, Leap year - Chinese calendar, Leap year - Hebrew calendar, Leap year - Hindu Calendar, Leap year - Iranian calendar, Leap year - Long term leap year rules, Leap year - Marriage proposal, Leap year - Saint Patrick and the leap year, Leap year - Birthdays

Read more here: » Leap year: Encyclopedia II - Leap year - Birthdays

The accumulated difference between the Gregorian calendar and the vernal equinoctial year amounts to 1 day in about 8,000 years. This suggests that the calendar needs to be improved by another refinement to the leap year rule: perhaps by avoiding leap years in years divisible by 8,000. (The most common such proposal is to avoid leap years in years divisible by 4,000 [1]. This is based on the difference between the Gregorian calendar and the mean tropical year. Others claim, erroneously, that the Gregorian calendar ...

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Leap year, Leap year - Gregorian calendar, Leap year - Which day is the leap day?, Leap year - Julian calendar, Leap year - Revised Julian Calendar, Leap year - Chinese calendar, Leap year - Hebrew calendar, Leap year - Hindu Calendar, Leap year - Iranian calendar, Leap year - Long term leap year rules, Leap year - Marriage proposal, Leap year - Saint Patrick and the leap year, Leap year - Birthdays

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The Hebrew calendar is also lunisolar with an embolistic month. In the Hebrew calendar the extra month is called Adar Alef (first Adar) and is added before Adar, which then becomes Adar Sheni (second Adar). According to the Metonic cycle, this is done seven times every nineteen years, specifically, in years, 3, 6, 8, 11, 14, 17, and 19. In addition, the Hebrew calendar has postponement rules that postpone the start of the year by one or two days. The year before the postponement gets one or two extra days, and the year w ...

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Leap year, Leap year - Gregorian calendar, Leap year - Which day is the leap day?, Leap year - Julian calendar, Leap year - Revised Julian Calendar, Leap year - Chinese calendar, Leap year - Hebrew calendar, Leap year - Hindu Calendar, Leap year - Iranian calendar, Leap year - Long term leap year rules, Leap year - Marriage proposal, Leap year - Saint Patrick and the leap year, Leap year - Birthdays

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The Julian calendar adds an extra day to February in years divisible by 4. This rule gives an average year length of 365.25 days. The excess of about 0.0076 days with respect to the vernal equinox year means that the vernal equinox moves a day earlier in the calendar every 130 years or so. ...

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Leap year, Leap year - Gregorian calendar, Leap year - Which day is the leap day?, Leap year - Julian calendar, Leap year - Revised Julian Calendar, Leap year - Chinese calendar, Leap year - Hebrew calendar, Leap year - Hindu Calendar, Leap year - Iranian calendar, Leap year - Long term leap year rules, Leap year - Marriage proposal, Leap year - Saint Patrick and the leap year, Leap year - Birthdays

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The Revised Julian calendar adds an extra day to February in years divisible by 4, except for years divisible by 100 that do not leave a remainder of 200 or 600 when divided by 900. This rule agrees with the rule for the Gregorian calendar until 2799. The first year that dates in the Revised Julian calendar will not agree with the those in the Gregorian calendar will be 2800, because it will be a leap year in the Grego ...

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Read more here: » Leap year: Encyclopedia II - Leap year - Revised Julian Calendar