first lunar meridian

first lunar meridian

[¦fərst ¦lün·ər mə′rid·ē·ən]
(astronomy)
The great circle on the moon which passes through the poles and through the center of the side of the moon that faces the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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