author
Johannes Kepler
1571–1630
A restless, brilliant thinker who helped change astronomy forever, he showed that planets move in ellipses rather than perfect circles. His work turned careful observation into powerful laws of motion and helped shape the Scientific Revolution.
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About the author
Johannes Kepler was a German mathematician, astronomer, and natural philosopher born in Weil der Stadt on December 27, 1571, and he died in Regensburg on November 15, 1630. He is best known for the three laws of planetary motion, which described how planets travel around the Sun and gave one of the clearest early mathematical foundations for modern astronomy.
Working with observations connected to Tycho Brahe, Kepler discovered that planetary orbits are not perfect circles but ellipses. That insight, published across works including Astronomia nova and later Harmonice Mundi, helped transform the Copernican picture of the universe from a bold idea into a more accurate physical model.
Kepler's interests reached well beyond planetary motion. He also wrote on optics, mathematics, calendars, and music theory, and his wide-ranging curiosity makes him a fascinating figure to read today. What stands out most is the way he combined imagination with exact calculation, always trying to find order in the sky without losing sight of the evidence.