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Declination
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==Explanation== {{Main|Equatorial coordinate system}} Declination in astronomy is comparable to geographic [[latitude]], projected onto the [[celestial sphere]], and right ascension is likewise comparable to longitude.<ref> {{cite book |url=https://books.google.com/books?id=PJoUAQAAMAAJ |title=An Introduction to Astronomy |last=Moulton |first=Forest Ray |date=1918 |publisher=Macmillan Co. |location=New York |page=125, art. 66}} </ref> Points north of the celestial equator have positive declinations, while those south have negative declinations. Any units of angular measure can be used for declination, but it is customarily measured in the [[Degree (angle)|degrees]] (°), [[Minute of arc|minutes]] (′), and [[Minute of arc|seconds]] (″) of [[sexagesimal|sexagesimal measure]], with 90° equivalent to a quarter circle. Declinations with magnitudes greater than 90° do not occur, because the poles are the northernmost and southernmost points of the celestial sphere. An object at the * celestial equator has a declination of 0° * [[Celestial pole|north celestial pole]] has a declination of +90° * [[Celestial pole|south celestial pole]] has a declination of −90° The sign is customarily included whether positive or negative.
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