/ Dictionary / Index C celestial longitude: Meaning and Definition of Find definitions for: celes'tial lon'gitude Pronunciation: [key] — Astron. Astron. the 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. celestial latitude celestial marriage Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language