Orazio Grassi (1583–1654) was an Italian mathematician, astronomer and architect.
Canonically pertaining to Society of Jesus, he was one of the authors in controversy with Galileo Galilei on the nature of the comets.
In 1619, his treatise Libra astronomica et philosophica was published under a pseudonym of Lotario Sarsi Sigenzano (an anagram of his name).
Grassi was born in Savona, Italy and died in Rome, Italy.
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