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Copernicus moved from Torun, Poland to Frombork, Poland.
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Copernicus started to write his book about his belief on the heliocentric solar system.
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Copernicus sent his book on the heliocentric solar system to be published.
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In December 1542, Copernicus had a stroke, leaving the left side of his body paralyzed.
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Copernicus died on May 24, 1543 because of the stroke.