Sidereal Day Definition

noun
The time between two successive passages of the vernal equinox across the meridian: it measures one rotation of the earth and equals 23 hours, 56 minutes, 4.1 seconds of mean solar time.
Webster's New World
Synonyms:

Other Word Forms of Sidereal Day

Noun

Singular:
sidereal day
Plural:
sidereal days

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sidereal day