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Greek astronomer Aristarchus of Samos suggested that the Earth revolved around the Sun(4th century)
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Greek astronomer Hiparchus classified the stars according to their apparent brightness(2nd century)
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He carried out very detailed observations of the planets(16th century)
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He published his heliocentric theory
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He used a telescope to observe the sky at night
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He built the first telescope using mirrors instead of lenses
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Isaac Newton published this book, in wich he explained the laws governing the movement of the planets
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Frederick William Herschel discovered the planet Uranus
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The work carried out by Jonh C. Adams, Johann G. Galle and Urbain J.J. Leverrier lead to the discovery of Neptune
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Clyde Tombaugh discovered the dwarf planet that later was named as Pluto
