Guidobaldo del Monte (1545–1607), Italian mathematician and astronomer, friend of Galileo
Guidobaldo became a staunch friend of Galileo and helped him again in 1592, when he had to apply to the chair of mathematics at the University of Padua, due to the hatred and machinations of Giovanni de' Medici, a son of Cosimo I de' Medici, against Galileo.
It drew on many authors, both classical writers and moderns such as Guidobaldo del Monte and Marin Mersenne.
Guidobaldo del Monte gave several verifications, and Humphry Ditton called the result the "main and Great Proposition".
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