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Galileo was born in Pisa, which at that time belonged to the Duchy of Florence.
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Galilee went to Florence with his family and took private lessons from Jacopo Borghini.After a while, at the request of his family, he went to the Camaldolese Monastery in Vollambrosa.
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He took mathematics courses at the University of Pisa under Tartaglia's student, Ostilio Ricci.
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He left without completing his medical education and focused entirely on mathematics.
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He wrote Le Balancitta, his first scientific book, and completed Archimedes' method of specific gravity.
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His father, Vincenzo Galilei, died
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He became a professor of mathematics at the University of Padua.
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In a letter to Kepler, he defended the Copernican Theory.
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They were the first children of Galileo Galilei and Maria Gamba.
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The Kepler Supernova was observed, and Galilei leaned on it.
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He wrote down his observations and discoveries in his book Siderus Nuncius.
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He observed Saturn. He detected strange formations on the edges of this celestial body.
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He observed Venus. He discovered that Venus has phases just like the moon.