Definitions from Wiktionary (sidereal day)

▸ noun:  (astronomy) One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds).
▸ noun:  (astronomy) The rotational period of Earth; the time in which Earth rotates around its axis 360 degrees.
▸ Also see sidereal_day


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