# 3rd law of planetary motion

1. Apr 24, 2007

### Xiphas

Can someone explain keplar's third law of planetary motion to me with out the math and not to technically, just what does it mean?

2. Apr 24, 2007

### cristo

Staff Emeritus
The square of the time period of a planet's orbit (i.e. the square of the time the planet takes to orbit the sun) is proportional to the cube of the average distance between the planet and the sun.