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Astronomy milestones: 1600s

 

planetary

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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