# 27/12/1571 Emperor's mathematician is born

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### Kepler's Three Laws of Planetary Motion: Mechanics

German mathematician and astronomer Johannes Kepler is most known for his three laws of planetary motion. Isaac Newton later used them to derive his law of general gravitation from them. Kepler started his career as an assistant to the astronomer Tycho Brahe. Later he became imperial mathematician to Emperor Rudolf II.
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