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Made the first accurate measurement of the Earth's circumference.
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Wrote a book of astronomical observations.
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Proposed that the Earth and other planets revolve around the sun, or the Heliocentric theory of the universe.
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Discovered one of the few recorded supernovas in the milky way galaxy.
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Discovered the three major laws of planetary motion.
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Predicted the shape of the Earth.
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Observation of a solar eclipse confirmed Einstein's prediction that light is bent in the presence of mass.