Astronomy Cast

Wizzard Media

Science & Medicine, Natural Sciences

Chart Positions

Natural Sciences 14
Science & Medicine 37

Astronomy Cast brings you a weekly fact-based journey through the cosmos.


Ep. 189: Johannes Kepler and His Laws of Planetary Motion

May 10th, 2010

Episode 221 of 460 episodes

Nicolaus Copernicus changed our understanding of the Universe when he rearranged the Solar System to put the Sun at the center, with the Earth becoming just another of the planets orbiting it. But the movement of the planets didn't really match the theory; not until Johannes Kepler came along with his ellipses, and everything finally worked.