Sidereal
/saɪˈdɪriəl/
Definition 1 of 3
Pro Tip 1/2Astronomy Term
Primarily used in astronomy to discuss phenomena related to the stars. 
The astrophysicist spoke about sidereal rotations.
Pro Tip 2/2Not Solar
Don't confuse 'sidereal' with 'solar', which relates to the sun. 
Sidereal is concerned with stars, unlike solar calendars. Compare with
AstralAstronomicalCelestialGalacticHeavenStarryStellar
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