A MOMENT IN HISTORY
Copernicus publishes On the Revolutions of the Heavenly Spheres
1543 CE · Poland, Europe · Science
De revolutionibus orbium coelestium is the seminal work on the heliocentric theory of the astronomer Nicolaus Copernicus. The book, first printed in 1543 CE in Nuremberg, Holy Roman Empire, offered an alternative model of the universe to Ptolemy's geocentric system, which had been widely accepted since ancient times.
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