Meaning & use
sidereal
Last updated
Relating to or measured with respect to the distant stars rather than the sun.
See it in a sentence
A sidereal day is about four minutes shorter than a solar day.
Astronomers use sidereal time to track the position of stars precisely.
A note on using this word
Sidereal is a technical astronomy term; don't confuse a 'sidereal day' with an ordinary 24-hour solar day.
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