Sidereal (adjective)
sidereal [sahy-deer-ee-uh l]

adjective, Astronomy
1. determined by or from the stars: sidereal time.
2. of or relating to the stars.

Origin: 1625-35; < Latin sidere (us) of, belonging to the stars ( sider-, stem of sidus star, constellation + -eus adj. suffix) + -al

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