sidereal day

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Definitions from WordNet

Noun sidereal day has 1 sense

sidereal day, day - the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
--₁ is a kind of time unit, unit of time; sidereal time

Definitions from the Web

Sidereal Day

Definition: A sidereal day is the time it takes for Earth to make a complete rotation on its axis relative to the fixed stars.

Example sentences:

One sidereal day lasts approximately 23 hours, 56 minutes, and 4.1 seconds.
The concept of a sidereal day is vital in astronomical calculations and observations.
The duration of a sidereal day differs slightly from a solar day due to the Earth's orbital motion around the Sun.

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