fortnightly nutation

fortnightly nutation

[‚fȯrt¦nīt·lē nü′tā·shən]
(astronomy)
Nutation caused by the change in declination of the moon, having a displacement of up to 0.1 second of arc and a period of 15 days.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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