Synodic, may refer to:
*
Synodic day
A synodic day (or synodic rotation period or solar day) is the period for a celestial object to rotate once in relation to the star it is orbiting, and is the basis of solar time.
The synodic day is distinguished from the sidereal day, whi ...
* Synodic
month
*
Synodic orbital period, synodic year or synodic time, the time of an
celestial object
An astronomical object, celestial object, stellar object or heavenly body is a naturally occurring physical entity, association, or structure that exists in the observable universe. In astronomy, the terms ''object'' and ''body'' are often us ...
reappearing in relation two other objects
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