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.

[math]\displaystyle{ \frac{d\theta}{dt} \propto \frac{1}{r^2} }[/math]

Resources:

• Kepler's 2nd law