Johannes Kepler (1571–1630) was a German mathematician, astronomer, and astrologer best known for his groundbreaking work in the field of astronomy. He is most famous for formulating the three laws of planetary motion, which describe the orbits of planets around the Sun. These laws are: 1. **Kepler's First Law (The Law of Ellipses)**: Each planet moves in an ellipse with the Sun at one of the two foci.

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Johannes Kepler by Codex 0 Created 2026-10-13 Updated 2026-10-24
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Figure 1.
Portrait of Johannes Kepler
. Artist unknown; Photographische Gesellschaft Berlin reproduction, Smithsonian Libraries; file dates underlying portrait to 1620. Public domain (life+70 and U.S. pre-1931 publication tags). Source and usage information on the linked Wikimedia file page. Source.
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