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240 BCE
Eratosthenes is most famous for making the first good measurement of the size of Earth
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150
Ptolemy first major astronomical work the Almagest was completed
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1543
Copernicus publishes his major astronomical work 'Six Books Concerning the Revolutions of the Heavenly Orbs,'
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1572
Brahe made the observations of a supernova
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Kepler made the famous Keplerian telescope
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Newton developed his theories of gravitation
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Einstein created the Theory of General Relatively