Galilei, Galileo

1564-1642, Italian astronomer, mathematician, and physicist was born in Pisa, Italy. He started Pisa

University as a medical student in 1581, and became

professor of mathematics at Padua(1592-1610), where he

improved the refracting telescope (1610), and was the first person to use astronomy. At the age of 19 he found out the principle of isochronism-that each oscillation of a pendulum takes the same time despite the changes in amplitude. He found experimentally that bodies do not fall with velocities proportional to their weights, a conclusion received with hostility because it contradicted the accepted teaching of Aristotle.

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