Johannes Kepler

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Kepler's revolutionary laws of planetary motion

planetary orbits: Kepler, Newton, and gravity

frontispiece from Tabulae Rudolphinae (1627; “Rudolphine Tables”) by Johannes Kepler

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Johannes Kepler summary

Johannes Kepler

Q: What was Johannes Kepler’s profession? When and how did it begin?

Johannes Kepler was an astronomer. He originally studied to be a theologian at the University of Tübingen. He became very interested in astronomy , and his math professor Michael Maestlin encouraged his interest. Maestlin was an early believer in Nicolaus Copernicus ’s idea that Earth and the other planets move around the Sun . He taught Kepler all about Copernicus’s ideas.

Q: What was Johannes Kepler known for?

Johannes Kepler is best known for his three laws of planetary motion . These laws are:

Q: Who did Johannes Kepler influence?

Johannes Kepler and his laws were a great influence on Isaac Newton . Newton came up with a law of gravity , which states that masses attract each other with a force inversely proportional to the square of the distance between them. Newton used his laws of gravity and motion to derive Kepler’s laws and show that the motion of the planets could be explained using mathematics and physics .

Q: Where was Johannes Kepler born?

Johannes Kepler was born on December 27, 1571, in the town of Weil der Stadt in the duchy of Württemberg , now in Germany .

Q: How and where did Johannes Kepler die?

After contracting a fever, Johannes Kepler died on November 15, 1630, in Regensburg, in the duchy of Bavaria , now in Germany. He had gone to Regensburg to collect interest on Austrian bonds he had. His grave was destroyed only a few years after his death during the Thirty Years’ War.

German astronomer

Written by Robert S. Westman

Fact-checked by The Editors of Encyclopaedia Britannica

Last Updated: Dec 23, 2024 • Article History

Quick Facts

Born:: December 27, 1571, Weil der Stadt, Württemberg [Germany]

Died:: November 15, 1630, Regensburg (aged 58)

Notable Works:: “Astronomia Nova”; “Concerning the More Certain Fundamentals of Astrology”; “De Stella Nova”; “Epitome of Copernican Astronomy”; “Harmonies of the World”; “Prodromus Dissertationum Mathematicarum Continens Mysterium Cosmographicum”

Subjects Of Study:: Kepler’s Nova; Copernican system; Kepler’s laws of planetary motion; atmospheric refraction; planet; Solar System; space motion; vision; volume

Role In:: Scientific Revolution

What was Johannes Kepler’s profession? When and how did it begin?

What was Johannes Kepler known for?

Who did Johannes Kepler influence?

Where was Johannes Kepler born?

How and where did Johannes Kepler die?

Johannes Kepler (born December 27, 1571, Weil der Stadt, Württemberg [Germany]—died November 15, 1630, Regensburg) German astronomer who discovered three major laws of planetary motion, conventionally designated as follows: (1) the planets move in elliptical orbits with the Sun at one focus; (2) the time necessary to traverse any arc of a planetary orbit is proportional to the area of the sector between the central body and that arc (the “area law”); and (3) there is an exact relationship between the squares of the planets’ periodic times and the cubes of their mean distances from the Sun (the “harmonic law”). ...(100 of 3352 words)

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