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How did Kepler know planets swept out equal areas (over the same time)?

April 26, 2017areas Kepler planets swept time

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How did Kepler know planets swept out equal areas (over the same time)?

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He realized this after carefully examining Tycho’s precise astronomical data and trying to match the measurements to different models of planetary motion. What he found was that the observations matched a model in which the planets moved in ellipses, and swept out equal areas in equal times.