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1. Oxford American Dictionary

   sidereal year

   • IPA[sīˈdirēəl yir]

   • n.
     the orbital period of the earth around the sun, taking the stars as a reference frame. It is 20 minutes longer than the solar or tropical year because of precession.

   • noun: sidereal year, plural noun: sidereal years

2. • 更多解釋

   sidereal year

   • n.
     the orbital period of the earth around the sun, taking the stars as a reference frame. It is 20 ...

   Oxford Dictionary