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Possibly the first construction observitory built in midevil Islam; however the paron of the observitory was founded guilty o several crimes and was sentenced to death-causing the program to be shutdown and destroyed.
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An observitory was built by astronomer, Ulugh Beg, that contained outdoors instruments, and producedasronomical tables that inclueded a catolag of one-thousand stars.
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Copernicus published his heliocentric theory of the universe.
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Tycho Brahe discovered a supernova constillation of Cassiopeia.
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Johann Bayer introduces Bayer designation of stars, assigning Greek letter to each star; as used today.
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Hans Lippershey invented the telescope.
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The first reflective telescope was built b Newton.
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Geminiano Montanari discovers the star Algol is not steady in brightness.
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While in Paris, Danish astronomer Ole Romer measures the speed of light.
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The discovery of Uranus by Herschel.