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geocentric, astronomy, treatises, almagest, crater, constellations.
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heliocentric, controversial, initiator, heliocentric model, revolution, not afraid.
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physicist, imprisoned, telescope, compass, heliocentric, sun spots, motion
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three laws, elliptical, planetary motion, astronomer, heliocentric, cubed distance.
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Hanz Lippershey
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motion, orbital cannon, calculus, telescopes, stars, gravity.
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