De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres), a work by Nicolaus Copernicus which contains a treatise on the heliocentric and heliostatic structure of the universe. The book was a major breakthrough in science and perception of the world at that time. It consists of six volumes.
The book was printed by Heinrich Petri (1508-1579), a Swiss printer, son of Adam Petri (1454-1527) and Anna Selber. Since 1530, after his father's death, Heinrich Petri, the stepson of Sebastian Münster, ran the printing house he inherited from his father in Basel, where he printed the materials prepared by Münster.
Second edition: Basel 1566.
Title page
Cover: unstiffened parchment: 16th/17th century. (after conservation).