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February 29 in recent years
  2024 (Thursday)
  2020 (Saturday)
  2016 (Monday)
  2012 (Wednesday)
  2008 (Friday)
  2004 (Sunday)
  2000 (Tuesday)

February 29 is a date that occurs only every four years, in years evenly divisible by 4, such as 1988, 1996, 2008 or 2016 (with the exception of century years not divisible by 400, such as 1900). These are called leap years, and February 29 is the 60th day of the Gregorian calendar in such a year, with 306 days remaining until the end of that year. February 29 is also known as bissextile day.

Leap years

Main article: Leap year

Although the modern calendar counts a year as 365 days, a complete revolution around the sun takes approximately 365 days and 6 hours. Every four years, an extra twenty-four hours have accumulated, so one extra day is added to that calendar to keep the count coordinated with the sun's apparent position.

A century year, which ends in two zeros, is not a leap year unless it is also evenly divisible by 400. This means that 1600 and 2000 were leap years, and 2400 and 2800 will also be, 1800 and 1900 were not, and the years 2100 and 2200 will not be leap years. To correct a slight inaccuracy that remains (it isn't exactly six hours extra), it has been proposed that years evenly divisible by 4,000 should not be leap years; but this rule has not been officially adopted.

A leap day is more likely to fall on a Monday than on a Sunday. This is because the Gregorian calendar repeats itself every 400 years, which is exactly 20871 weeks including 97 leap days. Over this period February 29 falls thirteen times on a Sunday, Tuesday or Thursday; fourteen times on a Friday or Saturday; and fifteen times on a Monday or Wednesday.

The concepts of the leap year and leap day are distinct from the leap second, which results from changes in the Earth's rotational speed.

The Romans, already realizing the need for an extra day every four years, chose February 24 because it followed the last day of their calendar, which then was February 23. It was given the name "bissextile day" meaning extra sixth day before the Kalends of March or start of a new year.

An English law of 1256 decreed that in leap years, the leap day and the day before are to be reckoned as one day for the purpose of calculating when a full year has passed. Thus, in England and Wales a person born on February 29 legally reaches the age of 18 or 21 on February 28 of the relevant year. In the European Union, February 29 officially became the leap day only in 2000.

There was a tradition that women may make a proposal of marriage to men only in leap years, further restricted in some cases to only February 29. There is a tradition that in 1288 the Scottish parliament under Queen Margaret legislated that any woman could propose in Leap Year; few parliament records of that time exist, and none concern February 29. Another component of this tradition was that if the man rejects the proposal, he should soften the blow by providing a kiss, one pound currency, and a pair of gloves (some later sources say a silk gown). There were similar notions in France and Switzerland.

In France, there is a humorous periodical called La Bougie du Sapeur (The Sapper's Candle) published every February 29 since 1980. The name is a reference to the sapper Camembert. The eighth issue will be published in 2008.

Events

Births

A person who was born on February 29 may be called a "leapling". In non-leap years they may celebrate their birthday on 28 February or 1 March.

For legal purposes, their legal birthdays depend on how different laws count time intervals. In England and Wales the legal birthday of a leapling is 28 February in common years (see Leap Years, above). In Taiwan the legal birthday of a leapling is also February 28 in common years. In both cases, a person born on February 29 1980 would have legally reached 18 years old on February 28 1998.

"If a period fixed by weeks, months, and years does not commence from the beginning of a week, month, or year, it ends with the ending of the day which proceeds the day of the last week, month, or year which corresponds to that on which it began to commence. But if there is no corresponding day in the last month, the period ends with the ending of the last day of the last month."

There are many instances in children's literature where a person's claim to be only a quarter of their actual age turns out to 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. Frederic, born on February 29, was apprenticed to a band of pirates until his 21st birthday, meaning that with all the missed birthdays, until he was 84 years old.


Deaths

Holidays and observances


External links


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Notes

  1. Some modern authors dispute this, although they are unable to cite any source which says that an alternative date was used.
  2. Clarissa Bye, "Take the Leap Today, Girls," Sydney Morning Herald, February 29, 2004. Retrieved July 27, 2007.
  3. Article 121 of the Civil Code Part I General Principles of the Republic of China in effect in Taiwan.
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