Sidereal Year

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Sidereal Year

</dt>
The period of one apparent revolution of the earth around the sun, with respect to the stars, averaging 365 days 6 hours 9 minutes 9.55 seconds in 1955, and increasing at the rate of 0.000095 second annually. </dd>
Because of the precession of the equinoxes this is about 20 minutes longer than a tropical year. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use