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Ptolemy
Ptolemy suggests geocentric theory of the universe in famous work Mathematike Syntaxis. -
Apr 29, 1054
Supernova observed
Chinese astronomers observe supernova in Taurus. -
Apr 29, 1120
Observatory in Ciaro
Construction of an observatory in Cairo was begun in 1120 A.D. This is possibly the first observatory built in Medieval Islam -
Apr 29, 1543
Heliocentric theory
Copernicus publishes his heliocentric theory of the Universe. -
Speed of light
While in Paris, Danish astronomer Ole Romer measures the speed of light. -
Newton
The first reflecting telescope was built by Newton.
1669 A.D. Italy -
Halleys comet
Halley correctly predicts the return of a comet (Halley's comet) in 1758. -
Jupiter
The Great Red Spot on Jupiter becomes prominent. -
Sputnik
Sputnik, first object to orbit the Earth, launched by the Russians. -
School astromony
Al Mamon founds the Baghdad school of astronomy.