Descension
Pronunciation : De*scen"sion
Part of Speech : n.
Etymology : [OF. descension, L. descensio. See Descent.]
Definition : Defn: 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.]
Source : Webster's Unabridged Dictionary, 1913