sidereal day
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sidereal day: see sidereal time sidereal time (ST), time measured relative to the fixed stars; thus, the sidereal day is the period during which the earth completes one rotation on its axis so that some chosen star appears twice on the observer's celestial meridian.
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sidereal day [sī′dir·ē·əl ′dā]

(astronomy)

The time between two successive upper transits of the vernal equinox; this period measures one sidereal day.

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sidereal day (redirected from sidereal days)

sidereal day
(redirected from sidereal days)