The time it takes for a planet to return to the same position with respect to the Sun and Earth in its orbit, such as the time from opposition to the next opposition, is known as:

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The synodic period is the time it takes for a planet to return to the same position with respect to the Sun and Earth in its orbit, such as the time from opposition to the next opposition. This is different from the planet's sidereal period, which is the time it takes for the planet to complete one orbit around the Sun relative to the fixed stars.

The Time It Takes for a Planet to Return to the Same