The "third Law"
Kepler discovered his "third law" a decade after the publication of the Astronomia nova as a result of his investigations in the 1619 Harmonices Mundi (Harmonies of the world). He found that the ratio of the length of the semi-major axis of each planet's orbit (cubed), to the time of its orbital period (squared), is the same for all planets.
Read more about this topic: Astronomia Nova
Famous quotes containing the word law:
“My hope is ... that we may recover ... something of a renewal of that vision of the law with which men may be supposed to have started out with in the old days of the oracles, who communed with the intimations of divinity.”
—Woodrow Wilson (1856–1924)