Johannes Kepler is read about 2,195 times a day, in 154 languages.
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Something wrong?He turned planetary motion from guesswork into geometry. Kepler's three laws showed that orbits were ellipses, not circles, and that a single mathematical language could describe the heavens - work that built the scaffold Newton would later climb.
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Johannes Kepler by Hans von Aachen
20221016 Mural Ulm
A Modern Depiction of the World, Done by Philippus Eckebrecht, Citizen of Nuremberg, for the Sole Reason of Bringing the Depiction into Line with the Equator According to the Astronomical Tabulae WDL166
Astronomia Nova Pages
Astronomia Nova Title Page
Benassit--Kepler and Tycho Brahe--Vies des savants illustres by Figuier Louis 1869
Benassit--Kepler-mother--Vies des savants illustres depuis by Figuier
CosmographeIn their own words 10
, The earth is the sphere, the measure of all; round it describe a dodecahedron; the sphere including this will be Mars.
Either... the moving intelligences of the planets are weakest in those that are farthest from the sun, or...
Nature uses as little as possible of anything.
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Johannes Kepler was born on 27 December 1571 in Germany and worked as a mathematics teacher at a seminary in Graz before becoming assistant to astronomer Tycho Brahe in Prague. After Brahe's death he rose to imperial mathematician for Emperor Rudolf II and his successors Matthias and Ferdinand II, later teaching in Linz and advising General Wallenstein. In an era when astronomy and astrology blurred together, he redrew the line: his books Astronomia nova, Harmonice Mundi, and Epitome Astronomiae Copernicanae recast astronomy as "celestial physics," part of a universal mathematical order he believed God had made intelligible through reason. He did foundational work in optics - earning the title father of modern optics for Astronomiae pars optica - and invented the Keplerian telescope, an improved refractor that became the basis for modern designs. He died on 15 November 1630, having also written Somnium, a novel that later earned him the nickname father of science fiction.
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