OpenStax
Open Stax: Satellites and Kepler's Laws: An Argument for Simplicity
In the following interactive students will begin to understand the laws of Kepler regarding planetary motion and derive the third law of Kepler for circular orbits. They will also discuss the Ptolemaic model of the universe.
Texas Education Agency
Texas Gateway: Satellites and Kepler's Laws: An Argument for Simplicity
By the end of this section, you will be able to state Kepler's laws of planetary motion, derive Kepler's third law for circular orbits, and discuss the Ptolemaic model of the universe.