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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 -
Tycho Brahe discovers a supernova in constellation of Cassiopeia.
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Pope Gregory XIII introduces the Gregorian calendar.
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Johann Bayer introduces Bayer designation of stars, assigning Greek letters to stars, still in use today.
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Hans Lippershey, a Dutch spectacles maker invents the telescope.
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Galileo uses telescope for astronomical purposes. He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy
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Armstrong and Aldrin walk on the Moon as part of Apollo 11 mission.
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Space Shuttle Challenger disaster
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New evidence found for water on Mars.
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Al Mamon founds the Baghdad school of astronomy.