syn·od·ic

[si-nod-ik]
adjective
1.
Astronomy. pertaining to a conjunction, or to two successive conjunctions of the same bodies.
2.
of or pertaining to a synod; synodal.
Also, syn·od·i·cal.


Origin:
1555–65; < Late Latin synodicus < Greek synodikós. See synod, -ic

syn·od·i·cal·ly, adverb
non·syn·od·ic, adjective
non·syn·od·i·cal, adjective
non·syn·od·i·cal·ly, adverb
sub·syn·od·ic, adjective
sub·syn·od·i·cal, adjective
sub·syn·od·i·cal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Synodic is always a great word to know.
So is apparent magnitude. Does it mean:
the magnitude or brightness of a star as it appears to an observer on the earth
the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux
Collins
World English Dictionary
synodic (sɪˈnɒdɪk) [Click for IPA pronunciation guide]
 
adj
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 10th Edition
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American Heritage
Science Dictionary
synodic   (sĭ-nŏd'ĭk)  Pronunciation Key 
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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Example sentences
It contains information on the sidereal and synodic periods of revolution of an orbiting satellite, including their calculation.
It would then be a crescent and rise towards fullness in the synodic period.
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