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  1. Christopher Clavius, SJ (25 March 1538 – 6 February 1612) was a Jesuit German mathematician, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed calendar invented by Aloysius Lilius, that is known as the Gregorian calendar.

  2. Mar 25, 2012 · Christopher Clavius was a German Jesuit astronomer who helped Pope Gregory XIII to introduce what is now called the Gregorian calendar. View three larger pictures. Biography. Christopher Clavius was born in a German region and must have had a German name before adopting the Latin 'Clavius'.

  3. In mathematics: Foundations of geometry. The Italian researchers Christopher Clavius in 1574 and Giordano Vitale in 1680 showed that the postulate is equivalent to asserting that the line equidistant from a straight line is a straight line.

  4. Learn about the life and work of Christopher Clavius, a German Jesuit who taught mathematics and astronomy in Rome and wrote influential textbooks. Find out how he reacted to Galileo's telescopic discoveries and the Copernican system.

  5. Learn about Christopher Clavius, a German Jesuit priest, astronomer and mathematician who reformed the calendar and promoted mathematical education. He was one of the founders of the Jesuit tradition of scientific research and teaching.

  6. Jun 11, 2018 · Christopher Clavius (1538-1612) was a German Jesuit astronomer, mathematician, and educator. He defended the Ptolemaic cosmology, criticized Copernicus, and taught Galileo's telescopic discoveries.

  7. Learn about Christoph Clavius, who was one of the major architects of the Gregorian calendar reform and a commentator on Ptolemaic astronomy. He had a favorable view of Galileo's telescopic discoveries, but rejected the physical reality of the Copernican system.