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Almagest, astronomer, constellations, geocentrism, stars, treatises
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Heliocentric, scientific revolution, orbits, controversial, model, change
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Heliocentric, compass, moons, acceleration, Dialogue, sun
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Nose, Tychonic, geocentric, supernova, Mars, Moon
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Elliptical, orbits, laws, model, 3rd law, gravity
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Hans Lippershey
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