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  1. sidereal day

    • n.
      the time between two consecutive transits of the First Point of Aries. It represents the time taken by the earth to rotate on its axis relative to the stars, and is almost four minutes shorter than the solar day because of the earth's orbital motion.
    • noun: sidereal day, plural noun: sidereal days

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    • IPA[sīˈdirēəl dā]
    • n.
      the time between two consecutive transits of the First Point of Aries. It represents the time ...

    Oxford American Dictionary