Galileo+Galilei3

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= Galileo Galilei //was famous for... // =

Inventing a 'calculating compass' for solving mathematics problems in Padua.  In 1609 he heard that in Holland a spy glass had been invented, and he was inspired to create the first telescope, which he used to discover the craters on the moon and the stars of the Milky Way.   **Galileo also wrote books. ** In 1613 he published a book about sunspots. Also,1624 Galileo published "Dialogue on the Tides" which descusses Ptolemaic and Copernican theories