Borrus, Christopher

(1583-1632) Mathematician and astronomer, born Milan; died Rome. He was one of the first Jesuit missionaries to Cochin-China, and later taught mathematics at Coimbra, and in 1632 became a Cistercian. His history of the Cochin-China mission is one of the best sources of information concerning that country. He drew up the first chart of the Atlantic and Indian oceans showing the spots where the magnetic needle makes the same angle with the meridian, thus anticipating Halley, and suggested a new method of determining longitude at sea.

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