Year

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(Calendar Year)
 
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A '''year''' is the time the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit.
A '''year''' is the time the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit.
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==Calendar Year==
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==Common Year vs Leap Year==
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A calendar year is the time between two dates with the same name in a calendar. Solar calendars usually attempt to predict the four seasons, but because the length of individual seasonal years varies significantly, they instead use an astronomical year as a surrogate. For example, the ancient Egyptians used the heliacal rising of Sirius to predict the flooding of the Nile.
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The average length of a year is 365.25 days. In a non-leap year (or '''common year'''), there are 365 days, in a '''leap year''' there are 366 days. A leap year occurs every 4 years.
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The Gregorian calendar attempts to keep the vernal equinox on or close to March 21; hence it follows the vernal equinox year. The average length of a year is 365.25 days. In a non-leap year, there are 365 days, in a [[leap year]] there are 366 days. A leap year occurs every 4 years.
 
==See Also==
==See Also==
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[[2008]]
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* [[1990]]
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[[Category: History]]
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* [[2008]]
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[[Category: History]] [[Category: Years]]

Current revision as of 16:12, 29 June 2009

A year is the time the orbit of the Earth around the Sun. By extension, this can be applied to any planet: for example, a "Martian year" is the time in which Mars completes its own orbit.

[edit] Common Year vs Leap Year

The average length of a year is 365.25 days. In a non-leap year (or common year), there are 365 days, in a leap year there are 366 days. A leap year occurs every 4 years.

[edit] See Also

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