1609 Johannes Kepler describes laws of planetary motion
1610 Galileo Galilei discovers moons of Jupiter
1655 Christian Huygens discovers Titan, moon of Saturn
1668 Isaac Newton builds first reflecting telescope
1687 Isaac Newton publishes theories of motions of planets, etc
1705 Edmond Hailey predicts return of comet
1671-84 Giovanni Cassini discovers four moon of Saturn
1774 Charles Messier compiles star catalogue
1781 william Herschel discovers 7th planet, Uranus
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