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Greek astronomer Aristarchus of Samos suggested that the Earth revolved around the Sun.
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The greek astronomer Hiparchus classified the stars according to their apparent brightness.
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Ptolemy suggested a geocentric astronomic model. According to him , the Sun, the moon and the five known planets all, revolved the planet.
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Copernicus published his heliocentric model according to which the planets revolved around the Sun.
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Tyco Brahe carried out very detailed observation of the observations.Kepler deduced his famous planetary laws following Brahe's observation.
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Galileo used a telescope for the first time to observe the night sky.
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Isaac Newton invented the first telescope using mirrors instead of lenses
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W.Herschel discovered the planet Uranus
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C. Tombaugh discovered the planet Pluto
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The discovery of the first extra-solar planets
