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geocentric longitude[¦jē·ō¦sen·trik ′län·jə‚tüd]
The celestial longitude of the position of a body projected on the celestial sphere when the body is viewed from the center of the earth.
At a position on the earth's surface, the angle between the plane of the reference meridian and a plane through the polar axis and a line from the position in question to the center of mass of the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.