synodic

Measuring apparent reunions

Synodic describes the period between two successive alignments of a celestial body with the sun as seen from Earth.

The synodic month—about 29.5 days—is the time from one new moon to the next, governing lunar calendars and tides.

The synodic period of Mars is roughly 780 days.

lunar

lunation

Moon's orbital period

waxing · waning · moonrise · moonset · syzygy · supermoon · tides · moonlight · perigee · apogee

orbital

conjunction

Word joining clauses together

syzygy · transit · occultation · inferior · superior · angular · separation · alignment · aspect · trine

period

orbit

Curved celestial path

anomalistic · sidereal · tropical · draconic · recurrence · periodicity · epoch · return · alignment · calendar

Opposites
astronomical reference frame

synodicsidereal

Of the stars

stellar · astral · absolute · inertial

Phrases
Family

synod, synodal, synodical

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