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Descen"sion (), n.[OF. descension, L. descensio. See Descent.] The act of going downward; descent; falling or sinking; declension; degradation. Oblique descension (Astron.), the degree or arc of the equator which descends, with a celestial object, below the horizon of an oblique sphere. Right descension, the degree or arc of the equator which descends below the horizon of a right sphere at the same time with the object. [Obs.]
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