Galileo Galilei was an Italian astronomer, mathematician, physicist, philosopher, and professor who made observations of nature that changed the sciences forever. Let us find out how he got there over the years.
Born February 15, 1564, Galileo was the eldest of six children to Vincenzo and Giulia. He began his formal education at the Camaldolse monastery in Vallombrosa. Fast forward to 1583, and Galileo enters the University of Pisa to study medicine. Being extremely intelligent and talented, he became interested in the fields of mathematics and physics. While he was studying at Pisa, he was introduced to the Aristotelian idea of the Earth centered universe. This view was sanctioned by the Roman Catholic Church and thus was the way everyone believed the universe was. In 1585, Galileo had to leave the university due to financial difficulties, even though he was on his way to being a professor.
University of Pisa
Even after leaving the university, Galileo continued to study mathematics and physics. Supporting himself through various teaching positions. Through his own studies he began publishing books on motion such as The Little Balance, which earned him a job at the University of Pisa, and Du Motu, which began the deviation from the Aristotelian view. Because of this second book, he was beginning to challenge the ideology of the Church which separated him from others (in good and bad ways.) Galileo moved on to the University of Padua in 1592, where he taught geometry, mechanics, and astronomy. This began his dive into astronomy and the Copernican theory that the earth was not the center of the universe.
Copernican Universe

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