WordReference Random House Unabridged Dictionary of American English © 2017
celestial longitude, [Astron.]
  1. Astronomythe angular distance of a point on the celestial sphere from the great circle that is perpendicular to the ecliptic at the point of the vernal equinox, measured through 360° eastward parallel to the ecliptic.


Collins Concise English Dictionary © HarperCollins Publishers::

celestial longitude n
  1. the angular distance measured eastwards from the vernal equinox to the intersection of the ecliptic with the great circle passing through a celestial body and the poles of the ecliptic
    Also called: ecliptic longitude



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