Submitted by vaterp t3_z10idk in askscience
eatabean t1_ixc0hi3 wrote
Reply to comment by Ignorhymus in How do astronomers share coordinates with each other? by vaterp
Astronomers use sidereal time, which represents one revolution of the earth, roughly 23 h 56 min. No, a day is not 24 hours long. So we use coordinated AND siderial time.
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