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or synodical

[si-nod-ik or si-nod-i-kuh l] /sɪˈnɒd ɪk or sɪˈnɒd ɪ kəl/
Astronomy. pertaining to a conjunction, or to two successive conjunctions of the same bodies.
of or relating to a synod; synodal.
Origin of synodic
1555-65; < Late Latin synodicus < Greek synodikós. See synod, -ic
Related forms
synodically, adverb
nonsynodic, adjective
nonsynodical, adjective
nonsynodically, adverb
subsynodic, adjective
subsynodical, adjective
subsynodically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for synodic


relating to or involving a conjunction or two successive conjunctions of the same star, planet, or satellite: the synodic month
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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synodic in Science
Relating to the conjunction of celestial bodies, especially to the interval between two successive conjunctions of a planet or the Moon with the Sun as viewed from Earth. For example, the new moon comes at the conjunction of the Moon with the Sun; the interval between successive new moons (the time it takes for the Moon to orbit the Earth and return to conjunction with the Sun) is the Moon's synodic period, also called a lunar month. Synodic time differs from sidereal time, which is measured in relation to the stars and is generally more appropriate to astronomical observation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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