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draconic month(dră-kon -ik) (nodical month) The time interval of 27.2122 days, on average, between two successive passages of the Moon through the ascending node (or descending node) of its orbit.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
draconic month[drə‚kän·ik ′mənth]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.