Sunday, March 8, 2026

in 1618, Third Law of Planetary Motion discovered


On March 8, 1618, Johannes Kepler discovered his Third Law of Planetary Motion, often called the Law of Harmonies. 

This breakthrough provided the mathematical link between a planet's distance from the Sun and the time it takes to complete an orbit. Kepler famously described the moment as an "epiphany" after nearly a decade of gruelling calculations.

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