circle of declination

circle of declination

noun Astronomy.

Origin:
1585–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Circle of declination is always a great word to know.
So is light-year. Does it mean:
the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km)
the polestar or North Star, a star of the second magnitude close to the north pole of the heavens, in the constellation Ursa Minor
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