### Formula

M

mass of the primary body

P

the orbital period of planet

a

the semimajor axis of the orbit

M

mass of the primary body

P

the orbital period of planet

a

the semimajor axis of the orbit

The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. The third law captures the relationship between the distance of planets from the Sun, and their orbital periods. G = 6.673848E-11 N.m2/kg2.

P

a

M

Precision

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