Selected category: angle.
Selected initial unit : second (astronomy).
Definition and details for second (astronomy):
Second (" or s or sec) is also a unit of angle measurement used in astronomy to count longitude. Astronomers divide the equator into 24 hours instead of 360 degrees and measure the right ascension, which is the longitude coordinate for positions in the sky, in units of time. This makes 1 second of longitude equal to 15 arcseconds.
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