How do we measure the orbital peri......

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Front (Question)

How do we measure the orbital periods of the planets ?

Back (Answer)

The true orbital period of planets, relative to the stars - the sidereal period, can be measured by using the synodic period - uses the Sun as a reference point.

We can relate these two quantities, allowing us to determine the true orbital period of a planet.

1/S = 1/P_A - 1/P_B

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