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Kepler worked along with Galileo and after he got a telescope eventually Improving Galileo's design.
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Kepler published his first two of three laws of planetary motion. This said planets moved around the sun in an ellipses and that the planets speed increases when they move closer to the sun but they decrease when they move away.
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Kepler published his third and final law in planetary motion. This used mathematics to find the distance of planets from the sun.
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Through Kepler's life he did work on optics. How the eye worked and he eventually published a book on it.
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Kepler worked and made improvement on Tycho's Rudolphne Table that Tycho invented before.
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