Limits of Keplerian Orbits
Some caveats and exceptions to Kepler's laws.
Articles in descending order of publication date:
Some caveats and exceptions to Kepler's laws.
How to use Kepler's 16th century equation to detect exoplanets in another star system.
Kepler was a smart man. In the 16th century, he found an elegant set of equations for predicting where a planet will be in the sky, and we still use that system to this day, even for other star systems!