Galileo was the great Italian scientist.
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Galileo Galilei (15 February 1564- 8 January 1642) was an Italian physicist, mathematician, astronomer, and philosopher who played a major role in the Scientific Revolution. He championed Copernicus' heliocentric ideas and contributed to observational astronomy including:-the telescopic confirmation of the phases of Venusthe discovery of the four largest satellites of Jupiter (named the Galilean moons in his honor)the observation and analysis of sunspots.Galileo also worked in applied science and technology, inventing an improved military compass and other instruments.