Seen From
Finding the time between successive oppositions of one planet as seen from another?
Knowing the orbital period of the two planets around the sun, is there an equation that expresses the time between successive oppositions of one planet as seen from the other?
That is called the synodic period and it is basically 1 / (1/E - 1/S) where E is the sidereal period of the planet you are observing from and S is the sidereal period of the other planet. This assumes both orbits are circular. That is a pretty close approximation of reality for most planets in our solar system, becasue most have elliptical orbits with pretty small eccentricities..
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