Johannes Kepler was born in Weil der Stadt in Swabia, in southwest Germany. From 1574 to 1576 Johannes lived with his grandparents; in 1576 his parents moved to nearby Leonberg, where Johannes entered the Latin school. In 1584 he entered the Protestant seminary at Adelberg, and in 1589 he began his university education at the Protestant university of Tubingen. Here he studied theology and read widely. He passed the M.A. examination in 1591 and continued his studies as a graduate student.

There he was influenced by a mathematics professor, Michael Maestlin, an adherent of the heliocentric theory of planetary motion first developed by the Polish astronomer Nicolaus Copernicus. Kepler accepted Copernican theory immediately, believing that the simplicity of Copernican planetary ordering must have been God's plan. In 1594 Kepler accepted an appointment as prof

Kepler held the chair of astronomy and mathematics at Graz University from 1594 until 1600. Because of his talent as a mathematician, displayed in his thesis, Kepler was invited by Tycho Brahe to Prague to become his assistant and calculate new orbits for the planets from Tycho's observations. Kepler moved to Prague in 1600. Kepler served as Tycho Brahe's assistant until the Brahe's death. On the death of Brahe in 1601, Kepler assumed his position as imperial mathematician and court astronomer to Rudolf II, Holy Roman emperor. In 1609 his Astronomia Nova ("New Astronomy") appeared, which contained his first two laws: planets move in elliptical orbits with the sun as one of the laws, and a planet sweeps out equal areas in equal times. This means that the closer a planet comes to the sun, the more rapidly it moves. Whereas other astronomers still followed the ancient precept that the study of the planets is a problem only in kinematics, Kepler took an openly active approach, int!

In 1612 Kepler became mathematician to the states of Up

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