Kepler's harmonic law states that the distance of a planet from the sun corresponds to the period of time it takes the planet to orbit the sun. the formula looks like this: . which statement best describes this formula summarizing kepler's harmonic law? the square of the orbital period of a planet around the sun is proportional to the cube of the planet's orbital radius. the square of the orbital radius of a planet to the sun is proportional to the cube of the planet's orbital period. the cube of the planet's orbital radius equals the orbital period of a planet around the sun. the orbital period to the second power of a planet around the sun is proportional to the planet's orbital radius to the fourth power.