Portal:Kepler's 2nd law

Johannes Kepler (b. 1571)

 Kepler's laws of planetary motion 1609-1619

A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.


 * $$\frac{d\theta}{dt} \propto \frac{1}{r^2}$$

Resources:

 * Kepler's 2nd law