A 408-year-old math rule still dictates how every planet orbits our sun
Johannes Kepler published his third law of planetary motion in 1619, revealing a precise mathematical relationship between a planet's distance from the sun and the time it takes to complete an orbit.
Kepler's Third Law established that the square of a planet's orbital period is directly proportional to the cube of its average distance from the sun. This elegant ratio ensures that distant planets like Neptune move much slower than those closer to the sun, such as Mercury.
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