The synodic period of a planet (or other astronomical body) is the period of time over which its observability cycles. This calculator finds the synodic period of a planet using the following formula:
Synodic period = 1 / |(1/365.26) – (1/orbital period)|
where the orbital period is the time it takes for a given planet to orbit the sun.
To find the synodic period for a given planet (or other object), simply enter the orbital period value (in days) of the planet below and then click the “Calculate” button.