Home > Terms > English, UK (UE) > Kepler's laws of planetary motions and orbits

Laws governing the motions of planets in their orbits:. # the orbits of the planets are ellipses with the sun at a common focus. # the line joining a planet and the sun sweeps over equal areas during equal intervals of time. # the squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.