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augmentationThe difference at a particular time between the topocentric and geocentric semidiameter of a celestial body. See also diurnal libration.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The apparent increase in the semidiameter of a celestial body, as observed from the earth, as the body's altitude (angular distance above the horizon) increases, due to the reduced distance from the observer; used principally in reference to the moon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.