character: Johannes Kepler
topic: Kepler's Third Law, Harmonic Law and Planetary Distances
subject: Reading
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character: Isaac Newton
topic: Influence of Kepler's Laws on Gravity
subject: Reading
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character: Galileo Galilei
topic: Early Observations of Planetary Motion
subject: Reading
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character: Tycho Brahe
topic: Astronomical Measurements Leading to Kepler's Laws
subject: Reading
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