Galileo Galilei was born in Pisa (then part of the Duchy of Florence), Italy, on 15 February 1564, the first of six children of Vincenzo Galilei, a famous lutenist, composer, and music theorist, and Giulia (née Ammannati), who had married in 1562. Galileo became an accomplished lutenist himself and would have learned early from his father a scepticism for established authority, the value of well-measured or quantified experimentation, an appreciation for a periodic or musical measure of time or rhythm, as well as the results expected from a combination of mathematics and experiment. Three of Galileo's five siblings survived infancy. The youngest,
Italian submarine Galileo Galilei machine guns. "Galileo Galilei" was built at Tosi shipyard at Taranto. She was launched on March 19, 1934 and commissioned on October 16 of the same year . After delivery, "Galileo Galilei" together with other submarines of "Archimede"-class was assigned to 12th Squadron of the III Flotilla, later to become 41st and then 44th Submarine Squadron of the VII Submarine Group, based at Taranto. After a period of intensive training and short cruises, the Squadron was sent for training to Tobruk. In 1937, along with many other submarines of the Royal Italian Navy ("Regia Marina"), "Galileo Galilei" secretly participated in