Leap year
Leap Year
A Leap Year (pronunciation: /li:p jɪər/) is a year, occurring once every four years, which has 366 days including 29 February as an intercalary day.
Etymology
The term "Leap Year" comes from the fact that while a fixed date in the Gregorian calendar normally advances one day of the week from one year to the next, the day of the week in the 12 months following the leap day (from March 1 through February 28 of the following year) will advance two days due to the extra day thus "leaping over" one of the days in the week. For example, Christmas Day (December 25) fell on a Tuesday in 2001, Wednesday in 2002, and Thursday in 2003 but then "leapt" over Friday to fall on a Saturday in 2004.
Related Terms
- Gregorian Calendar: The calendar system currently in worldwide use for civil purposes. It has a leap year every four years.
- Julian Calendar: The predecessor to the Gregorian calendar. It has a leap year every four years without exception.
- Intercalary Day: A day that is inserted into a calendar in order to synchronize it with the solar year.
- Solar Year: The time taken by the Earth to orbit the Sun once with respect to the vernal equinox. It is about 365.2422 days long.
See Also
External links
- Medical encyclopedia article on Leap year
- Wikipedia's article - Leap year
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