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1643 in science
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==Deaths== * April 9 β [[Benedetto Castelli]], Italian mathematician (born [[1578 in science|1578]]) * November 3 ** [[John Bainbridge (astronomer)|John Bainbridge]], English astronomer (born [[1582 in science|1582]]) ** [[Paul Guldin]], [[Swiss people|Swiss]] mathematician and astronomer (born [[1577 in science|1577]]) * [[Sophia Brahe]], [[Danish people|Danish]] astronomer (born [[1556 in science|1556]]) * [[Gasparo Berti]], Italian mathematician, astronomer and physicist (born c. 1600) * [[Walter Warner]], English scientist (born [[1563 in science|1563]])
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