augmentation

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augmentation

The difference at a particular time between the topocentric and geocentric semidiameter of a celestial body. See also diurnal libration.

augmentation

[‚ȯg·mən′tā·shən]
(astronomy)
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.
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