-
400 BCE
Aristarchus of Samos
he suggested that the Earth revolved around the sun -
200 BCE
Hiparchus
Classified the stars according to their apparent brightness -
200
Ptolemy
Suggested a geocentric astronomic model. According to him, the sun, the moon and the five known planets ( Mercury, Venus ,Mars, Jupiter, and Saturn) all revolved around the Earth. -
Sep 12, 1543
Copernicus
Published his heliocentrical model according to which the planets revolved around the sun. -
Tyco Brahe
Carried out very delaited observation of the planets. Kepler deduce his famous planetary laws following Brahe´s observation. -
Galileo
Used a telescope for the first time to observe the night sky. This was the birth of of modern astronomy -
Isaac Newton
Built the first telescope using mirrors instead of lenses -
The Principles of Natural Phylosophy
Newton published his book The Principles of Natural Phylosophy in which he explained the laws governing the movement of the planets. -
Edmund Halley
He explained Newton´s laws and predicted the return of the comet ( which was to carry his name) in 1758 -
W. Herschel
Discovered the planet Uranus -
F.W. Bessel
Measured the distance from a star for the first time using geometric methods. This in turn, definitively proved that Earth follows an orbit around the Sun as Copernicous suggested. -
Adams, Galle and Leverrier
They discovered Neptune -
Science Asthrophysics
The birth of the science Astrophysics thanks to the spectroscope, an apparatus which allows us to identify substances in the stars . -
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. -
C. Tombaugh
Discoverede the planet pluto -
extra solar system
The discovered of the extra solar planet
