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apr 29, 1609 - Kepler publishes his first two laws of planetary motion

Description:

These laws exemplified that planetal orbit was more eliptical shaped than circular and how the speed of planets varied as they were further from the sun. These laws contradicted Copernicous' theories and led to advancements in understanding the solar system

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Date:

apr 29, 1609
Now
~ 416 years ago