Germany
Johannes Kepler
said
The earth is the sphere, the measure of all; round it describe a dodecahedron; the sphere including this will be Mars.
— pp. 16–17.
Johannes Kepler
German mathematician and astronomer (1571–1630)
- Fame83.6
- Momentum0.0
- Germany rank#23
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Summary
Updated 2026-07-17
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.
Biography
About
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 bel…
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In their own words
Sourced, dated quotes from Johannes Kepler
Johannes Kepler
said
Either... the moving intelligences of the planets are weakest in those that are farthest from the sun, or...
— p. 17.
Johannes Kepler
saidundated
Nature uses as little as possible of anything.
— As quoted by W. H. Auden, Louis Kronenberger, Viking Book of Aphorisms: A Personal Selection (1920) p. 98; also by Joseph Silk, The
Johannes Kepler
saidundated
We do not ask for what useful purpose the birds do sing, for song is their pleasure since they were created for singing.
— As quoted by Carl Sagan Cosmos (1980)
Johannes Kepler
saidundated
There is a force in the earth which causes the moon to move.
— Essay dedicated to the Archduke Ferdinand, as quoted by Max Caspar, Kepler (1993) Sect. II, Ch. 9, p. 110.
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