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Descension

Source : Webster's Revised Unabridged Dictionary (1913)

Descension \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. [Obs.]
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