planetary theory

Discusses the life and discoveries of astronomer Johannes Kepler.

Chronicles the lives of sixteenth-century Danish and German astronomers Tycho Brahe and Johannes Kepler and explains how Tycho's inaccurate findings actually helped Kepler develop the three Laws of Planetary Motion, on which modern cosmology is based.

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

Explains the laws of planetary motion and describes how scientists have found new planets outside the solar system.

Examines the life and accomplishments of Johannes Kepler, the seventeenth-century astronomer responsible for discovering how the planets move in their orbits around the sun, and includes a time line, and a selection of primary source transcriptions and images.