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4 BCE
Earth and Sun
Greek astronomer Aristarchus of Samos suggested that the Earth revolved around the Sun(4th century) -
2 BCE
Classifying stars
Greek astronomer Hiparchus classified the stars according to their apparent brightness(2nd century) -
16
Tyco Brahe
He carried out very detailed observations of the planets(16th century) -
Sep 15, 1543
Copernicus
He published his heliocentric theory -
Galileo
He used a telescope to observe the sky at night -
Isaac Newton
He built the first telescope using mirrors instead of lenses -
The Principles of Natural Philosophy
Isaac Newton published this book, in wich he explained the laws governing the movement of the planets -
Discovering Uranus
Frederick William Herschel discovered the planet Uranus -
Finding Neptune
The work carried out by Jonh C. Adams, Johann G. Galle and Urbain J.J. Leverrier lead to the discovery of Neptune -
Searching for Pluto
Clyde Tombaugh discovered the dwarf planet that later was named as Pluto
