celestial longitude

n.
The angular distance eastward from the vernal equinox along the ecliptic to the great circle drawn through the pole of the ecliptic and a celestial body.

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The noun has one meaning:

Meaning #1: (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
  Synonyms: right ascension, RA

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