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Kepler's Laws

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Copernicus set everyone on the right track with the heliocentric model but they still had to use epicycles to explain the planetary motions. What did Kepler introduce into the equation that allowed for the irregular planetary motions? (hint: it is a shape!). What are Kepler's Laws? What is eccentricity?

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What are Kepler's Laws? What is eccentricity? These answers are offered.

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Kepler actually stated as his first of three laws that: The orbit of every planet is an ellipse with the Sun at one of the two foci. This fact of the planet orbits being "ellipses" was the crucial point.

Kepler introduced 3 laws:
1. The orbit of every planet is an ellipse with ...

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