Kepler’s Laws of Planetary Motion 1. Kepler’s first law: The planets move in elliptical orbits around the sun, with the sun at one of the two foci of the elliptical orbit.

It was Sir Isaac Newton (1642-1727) who would remove any mathematical doubts that the Earth orbits the sun through his universal laws of gravitation. In the diagram above, adapted from Newton’s ...

Physics, particularly forces and motion, can be challenging. By observing everyday motion, conducting simple experiments, and understanding Newton's laws in plain language, the concepts become ...