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 for celestial longitude
From WordNet (r) 3.0 (2006) :

  celestial longitude
      n 1: (astronomy) the equatorial coordinate specifying the angle,
           measured eastward along the celestial equator, from the
           vernal equinox to the intersection of the hour circle that
           passes through an object in the sky; usually expressed in
           hours and minutes and seconds; used with declination to
           specify positions on the celestial sphere; "one hour of
           right ascension equals fifteen degrees" [syn: right
           ascension, RA, celestial longitude]

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