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Johannes Kepler
Johannes Kepler 1610.jpg
Portrait of Kepler by an unknown artist, 1610
Born (1571-12-27)December 27, 1571
Free Imperial City of Weil der Stadt, Holy Roman Empire
Died November 15, 1630(1630-11-15) (aged 58)
Regensburg, Electorate of Bavaria, Holy Roman Empire
Residence Württemberg; Styria; Bohemia; Upper Austria
Nationality German
Fields Astronomy, astrology, mathematics and natural philosophy
Institutions University of Linz
Alma mater Tübinger Stift, University of Tübingen
Doctoral advisor Michael Maestlin
Known for Kepler's laws of planetary motion
Kepler conjecture
Rudolphine Tables
Influences Nicolaus Copernicus
Tycho Brahe
Signature

Johannes Kepler (/ˈkɛplər/;German: [joˈhanəsˈkɛplɐ]; December 27, 1571 – November 15, 1630) was a German mathematician, astronomer, and astrologer. A key figure in the 17th-century scientific revolution, he is best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. These works also provided one of the foundations for Isaac Newton's theory of universal gravitation.

Kepler was a mathematics teacher at a seminary school in Graz, where he became an associate of Prince Hans Ulrich von Eggenberg. Later he became an assistant to the astronomer Tycho Brahe in Prague, and eventually he was the imperial mathematician to Emperor Rudolf II and his two successors Matthias and Ferdinand II. He was also a mathematics teacher in Linz, and an adviser to General Wallenstein. Additionally, he did fundamental work in the field of optics, invented an improved version of the refracting telescope (the Keplerian telescope), and was mentioned in the telescopic discoveries of his contemporary Galileo Galilei.


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