According to Kepler's third law of planetary motion, the period of revolution of a planet is related to the planet's what?
Kepler's third law relates the orbital period of a planet, or moon to its semi major axis distance.
Kepler's first law states that orbits are ellipses. The third law relates the orbital period
Kepler wrote the law as a proportionality.
Newton used his theory of gravity to find the constant of proportionality.
In the case of a solar system the mass of the sun
For our solar system if the value of the period
Hence for everything orbiting the Sun.