A biography of Johannes Kepler, the astronomer and mathematician who formulated the three laws of planetary motion.

APlusPhysics: Your Guide to Regents Physics Essentials is a clear and concise roadmap to the entire New York State Regents Physics curriculum, preparing student

Johannes Kepler is a fascinating man who would revolutionize humanity's conception of the cosmos and their place within it. He would replace the Ptolemaic syste

Presents the life and accomplishments of one of the pioneers of modern astronomy, who proved that the Sun is the center of the solar system.

As a student in Germany in the sixteenth century, Johannes Kepler became convinced the Sun was at the center of the planets and the universe operated on the sam