German mathematician, astronomer and Jesuit known for modifying the modern Gregorian calendar after the death of Aloysius Lilius, the primary author of the calendar.
Christopher Clavius was born on 25 March, 1538
Today's Events: 25 April
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att.com registered by AT&T
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Patent for IC – Robert Noyce
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Solar cell demonstrated for the first time
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Structure of DNA discovered
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DNA Day [DNA Day]
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Zev Siegl Birthday
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Richard C. Hoagland Birthday
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Albert Uderzo Birthday
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Mort Weisinger Birthday
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Wolfgang Pauli Birthday
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Guglielmo Marconi Birthday
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Édouard-Léon Scott de Martinville Birthday
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Charles Sauria Birthday
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Saul Bass Death Anniversary
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George Herriman Death Anniversary
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Siméon Denis Poisson Death Anniversary
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Anders Celsius Death Anniversary