De‐scen″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.