Christophorus Clavius (March 25, 1538 - February 6, 1612) was a German Jesuit mathematician and astronomer who was the main architect of the modern Gregorian calendar. Using the Prussian Tables of Erasmus Reinhold, he proposed a calendar reform that was adopted in 1582 in Catholic countries by order of Pope Gregory XIII and is now the Gregorian calendar used worldwide. | |
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