- Astronomy History - Johannes Kepler - Brief biography highlighting his status as a defender of Copernicus and a formulator of planetary-motion laws.
- Johannes Kepler - A short biography.
- Johannes Kepler and his Laws of Planetary Motion - Short biography and explanation of his laws.
- Johannes Kepler and the Music of the Spheres - An article by David Plant describing Kepler's astrological beliefs.
- More Kepler, by Michael Fowler - Part two of a biography, discussing Kepler's investigations of planetary motion and gravity.
- Starry Messenger: Johannes Kepler - Biography, and information on Kepler's mathematical techniques, poetry, and interest in astrology. From the Whipple Museum of the History of Science.
- The Galileo Project: Johannes Kepler - Illustrated article with references.
- Tycho Brahe and Johannes Kepler - Short biographies.
