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From: WordNet (r) 2.0

 celestial longitude
      n : (astronomy) the angular distance eastward along the
          celestial equator from the vernal equinox to the
          intersection of the hour circle that passes through the
          body; expressed in hours and minutes and second; used
          with declination to specify positions on the celestial
          sphere; "one hour of right ascension equals fifteen
          degrees" [syn: right ascension, RA]