More Kepler, by Michael Fowler
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Description: Part two of a biography, discussing Kepler's investigations of planetary motion and gravity.
Once Kepler had secured Tycho's data, he set himself the task of once and for all determining the exact orbit of Mars. A preliminary analysis showed the orbit to be at the center of the circle---it was at a point almost one-tenth of a radius away! Furthermore, it was clear that Mars
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