Kepler's Second Law

Illustrate Kepler's second law of planetary motion with the aid of a diagram

Law #2. The Sun-planet line sweeps out equal areas in equal times.

 

 Planets move faster when they are nearer the Sun (perihelion) and slower when they are further away (aphelion).

If you imagine a line connecting the Sun to the planet, this line sweeps out equal areas in equal times. If you look at the image on the right you will see that the time it takes for the planet to orbit A is the same time for the planet to orbit B.

 

Animation New Window

Kepler's Laws

Image New Window



Links New Window

Bill Drennon, Central Valley Christian High School Animated Kepler's Laws

Davidson's WebPhysics Animations

UBC's Interactive Mathematics Interactive Simulator