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Discovered the earth was round on june 19, 240 B.C
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He believed that the earth was at the center if the universe. he made this discovery in the 2nd century.
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he discovered his own celestial model of a heliocentric planetary system Around 1514.
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It hard to say when tycho discovered his theory of " The Tychonic system" but it could have been around the time before his passing.
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By using the data that tycho had kepler discovered planets move on an ellipse. discovery was made in 1609
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He discovered his theory of gravity in 1687
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he discovered his theory of general relativity in 1915