sidereal year

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sidereal year

sidereal year time required for the earth to complete an orbit of the sun relative to the stars. The sidereal year is 365 days, 6 hr, 9 min, 9.5 sec of mean solar time (see solar time ). It is 20 min longer than the tropical year because of the precession of the equinoxes ; for this reason, the sidereal year does not stay in step with the seasons.

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"sidereal year." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 7 Dec. 2009 <http://www.encyclopedia.com>.

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sidereal year

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

sidereal year The period of the Earth's orbital revolution around the Sun with reference to the stars. Its length is 365.256 36 days.

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year

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

year Length of time taken by the Earth to circle once round the Sun in its orbit. It is defined in various ways, such as the sidereal year, which is timed with reference to the fixed stars.

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	Technical Advances in Data Communications Alter Large-Scale Messaging Environment. Magazine article from: Communications News; 5/1/1985

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