lunar inequality

lunar inequality

[′lü·nər ‚in·i′kwäl·əd·ē]
(astronomy)
Variation in the moon's motion in its orbit, due to attraction by other bodies of the solar system.
(geophysics)
A minute fluctuation of a magnetic needle from its mean position, caused by the moon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.