The law of periods states that:
1
The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
2
The square of the period of any planet is proportional to the cube root of the semimajor axis of its orbit.
3
The cube of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
4
The cube of the period of any planet is proportional to the square root of the semimajor axis of its orbit.