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The angular distance of a celestial body from the vernal equinox, measured eastward along the ecliptic to a great circle passing sequentially through the body in question and the pole of the ecliptic. Also called ecliptic longitude.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Astronomy) 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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|Noun||1.||celestial longitude - (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"|
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
angular distance - the angular separation between two objects as perceived by an observer; "he recorded angular distances between the stars"
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