Johannes Kepler
By Chris Gothman and Hannah Braem
Define
Johannes Kepler was a German mathematician, astronomer, and astrologer. Amongst his many works, his most famous, was his laws of planetary motion.
Detail
Cause: Johannes Kepler left to Prague to become an assistant to another astronomer, Brahe. After being assigned to study the orbit of Mars, Brahe's assistant was well on his way to developing the laws of planetary orbit.
Significance: Johannes Kepler proposed three laws of planetary motion. They described the motion of planets in a sun-centered solar system, and are considered as an accurate description of the motion of any planet and any satellite.
Characteristics: He was born on December 27, 1571, in Weil der Stadt, Württemberg, in the Holy Roman Empire of German Nationality. He had a wife and two kids.