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4 BCE
The theory of the Sun and the Earth
The Greek astronomer Aristarchus of Samos suuggested that the Earth revolved around the Sun -
2 BCE
The stars classification
The Greek astronomer Hiparchus calssified the stars according to their apparent brighness. -
2 BCE
The Geocentric theory
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. -
16
Observation and Deduction
Tyco Brahe out every detailed observation of the planets.Kepler deduced his famous planetary laws following Brahe´s observation. -
Sep 13, 1543
The Heliocentric Theory
Copernicus published his heliocentric model according to which the planets revolved around the Sun. -
Laws and observations
Tyco Brahe carried out very detailed observation of the planets.Kepler deduced his famous planetary laws following Brahe¨s observation. -
Galileo used the telescope
Galileo used a telescope for the first time to observe the night sky. This was the birth of the modern astronomy. -
The new telescope
Isaac Newton built the first telescope using mirrors instead of lenses. -
The book of Newton
Newton published his book The Principles of Natural Philosophy in which he explained the laws governing the movements of the planets. -
The laws explanations
Edmund Halley explained Newton´s laws and predicted the return of the comet{which was to carry his name in 1758, -
Prove the Geocentric theory
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. -
Discover Neptune
The work carried out by Adams, Galle and Leverrier lead to the discovery f Neptune. -
Science helps to study stars
The birth of the science Astrophysics thanks to the spectroscope, an apparatus which allows us to identify substances in the stars. -
Galaxies move away
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. -
Discovered Pluto
C. Tombaugh discovered the planet Pluto. -
Extra Planets
The discovery of the first extra-solar planets.
