Submitted by vaterp t3_z10idk in askscience
Blakut t1_ixc15bm wrote
Reply to comment by derioderio in How do astronomers share coordinates with each other? by vaterp
they do. Earth's north pole projected onto the sky is the North Celestial Pole, and Earth's equator is projected onto the sky to give the Celestial Equator. Where the Sun's path in the sky intersects the Celestial Equator in spring defines the zero point.
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