Publisher Information: Venice: apud Io. Baptistam Ciottum, 1603. Later printing.
Clavius, Christophorus. In sphaeram Ioannis de Sacro Bosco commentarius. 4to. , 483,  pp. Woodcut text illustrations. Limp vellum c. 1603. Minor foxing and toning, but very good.
Seventh edition. Clavius (1538-1612), a member of the Jesuit order, was one of the most respected astronomers in Europe. He was the main architect of the Gregorian calendar (which we use today), and his astronomical textbooks were widely used for over fifty years. His commentary on the "Sphaera" of Sacrobosco, first published in 1570, demonstrates his adherence to the geocentric model of the universe.Book Id: 40331