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 …showed first 75 words of 512 total…

…showed last 75 words of 512 total…with all the planets, including the earth, revolving around it. Death of Galileo Galileo died January 8, 1642 in Arcetri(near Florence)(now in Italy). ------------------------------------------------------------------------ **Bibliography** Bibliography I.Internet-http://userwww.sfsu.edu/rsauzier/Gallileo.html II.Encyclopedia- www.Encyclopedia.com III.Pictures- 1{http://es.rice.edu/ES/humsoc/Galileo/Images/Port/Galileo/g.gif} 2{http://es.rice.edu/ES/humsoc/Galileo/g_passignani.gif} IV.Book- Galileo"First Observer of Marvellous Things" by Elma Ehrlich Levinger