Question

What is period in solar system

Answer 1

For the planets in the solar system, the synodic period (with respect to Earth) differs from the sidereal period due to the Earth's orbiting around the Sun.

Other 

Answer 2

The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets,  exoplanets orbiting other stars, or binary stars.