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Grezce
Greece Ptolemy suggests geocentric theory of the universe in famous work Mathematike Syntaxis.
Ptolemy a Greek astronomer who lived between 85-165 A.D. his theory states that the Earth was at the center of the universe -
Apr 29, 1572
Denmark
Tycho Brahe discovers a supernova in constellation of Cassiopeia. -
Apr 29, 1582
Italy
Pope Gregory XIII introduces the Gregorian calendar. -
Germany
Johann Bayer introduces Bayer designation of stars, assigning Greek letters to stars, still in use today. -
Netherlands
Hans Lippershey, a Dutch spectacles maker invents the telescope. -
italy
Galileo uses telescope for astronomical purposes. He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy -
The Moon
Armstrong and Aldrin walk on the Moon as part of Apollo 11 mission. -
U.S.A
Space Shuttle Challenger disaster -
Mars
New evidence found for water on Mars. -
Iraq
Al Mamon founds the Baghdad school of astronomy.