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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.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

More on sidereal year from Infoplease:

sidereal year: meaning and definitions - sidereal year: Definition and Pronunciation
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Astronomical Constants - Astronomical Constants Light-year (distance traveled by light in one year) 5,880,000,000,000 mi ...
precession of the equinoxes: meaning and definitions - precession of the equinoxes: Definition and Pronunciation
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