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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He shortly constructed another telescope with more nicety which magnified objects more than sixty times. F MOTION

Galileo discovered the path of a projectile is a parabola, and he is credited with anticipating Isaac

Newton’s laws of motion.

Copernican System

A work that upheld the Copernican System rather than the Ptolemaic System and marked a turning point in scientific and philosophical thought. By the time he had completed his fifth instrument, crowds began to stand for hours before his house.

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**Bibliography**

Bibliography

I. He said, he saw

objects satisfactorily large and near, for they appeared one-third of the distance off and nine times larger than when they are seen by the naked eye alone.

THE TELESCOPE

1609, he constructed the first astronomical telescope, which he used to discover the four largest satellites of Jupiter and the stellar composition of the Milky Way.

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