Today's puzzle
EarlierGutenberg Experiments with Printing1439 AD
LaterVermeer Paints Girl with a Pearl Earring1665 AD
Read as textRead on WikipediaShare this moment

De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory of the astronomer Nicolaus Copernicus (1473–1543 CE). 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.

Gallery
Key figuresNicolaus Copernicus
Where it happenedOpen in map
Meanwhile, elsewhere
  • AsiaHürrem Sultan Moves the Imperial Harem to Topkapı1541 AD · 2 years earlier
  • South AmericaPizarro Captures Atahualpa at Cajamarca1532 AD · 11 years earlier
  • North AmericaGuadalupe Tilma Presented1531 AD · 12 years earlier