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13,800 BCE
The Big Bang
The Big Bang was an expltion that created the universe ,it happened 13.8 billon of years -
400 BCE
The suggest that the Earth revolved around the Sun
The Greek astronomer Aristarchus suggested that the Earth revolded around the Sun -
200 BCE
The classifing of stars
The greek astronomer Hiparchus classified the stars according to their apparent brightness -
200
Geocentric model
Ptomely suggested the geocentric model=the Sun,the Moon,and the 5 planets all revolved around the Earth . -
Sep 19, 1543
Heliotic model
Copernicus published his heliotic model according to wich the planets revolved around the Sun -
First time using a telescope for observe the night sky
Galileo used a telescope for the first time to observe the night sky .This as the bright of modern astronomy -
First telescope using mirrors
Isaac Newton built the first telescope using mirrors insted of lenses -
Newton publish his book
Newton publish his book The Principles of Natural Philosofy in wich he explained the laws governing th emovment of the planests -
Halley explained Newton´s laws
Edmund Halley explained Newton´s laws and predicted the return of the comet in 1758 -
Uranus
W. Herschel discoverd the planet Uranus -
Distance from a star
F. W. Bessel measured the distance from a star for the first time using geometric methods.This provedthe heliotic theory -
Neptune
Adams,Galle,and Leverrier discovere Neptune -
Nebulas=Independent galaxies
E. P. Hubble preved tat some nebulas seen skyare in fact independent galaxies,then he discovered that the galaxies move away from each other -
Pluto
C. Tombaugh discovered Pluto -
Extra solar planets
The discovering of the first extra solar system
