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De revolutionibus orbium coelestium
De revolutionibus orbium coelestium (English: On the Revolutions of the Heavenly Spheres; German: Von den Umdrehungen der Himmelskörper; Polish: O obrotach sfer niebieskich), first printed in 1543 in Nuremberg, is the seminal work on heliocentric theory and the masterpiece of the great astronomer Nicolaus Copernicus (1473-1543). The book offers an alternative model of the universe to the Ptolemaic system.
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