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The Greek astronomer Aristarchus of Samos suuggested that the Earth revolved around the Sun
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The Greek astronomer Hiparchus calssified the stars according to their apparent brighness.
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Ptolemy suggested a geometric astronomic model.According to him,the Sun,the moon and the five known planets[Mercury,Mars,Jupiter and Saturn] all revolved around the Earth.
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Tyco Brahe out every detailed observation of the planets.Kepler deduced his famous planetary laws following Brahe´s observation.
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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 planets.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. This was the birth of the modern astronomy.
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Isaac Newton built the first telescope using mirrors instead of lenses.
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Newton published his book The Principles of Natural Philosophy in which he explained the laws governing the movements of the planets.
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Edmund Halley explained Newton´s laws and predicted the return of the comet{which was to carry his name in 1758,
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F.W Bessel measured the distance from a star for the first time using geometric methods.This,in turn,definitively proved that the Earth follows an orbit around the Sun as Copernicus suggested.
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The work carried out by Adams, Galle and Leverrier lead to the discovery f Neptune.
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The birth of the science Astrophysics thanks to the spectroscope, an apparatus which allows us to identify substances in the stars.
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E.P Hubble proved that some of the nebulas seen in the sky are in fact independent galaxies. He then discovered that the galaxies move away from each other.
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C. Tombaugh discovered the planet Pluto.
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The discovery of the first extra-solar planets.
