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Vikings discover North America.
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Chinese astronomers observe supernova in Taurus.
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Copernicus publishes his heliocentric theory of the Universe.
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Tycho Brahe discovers a supernova in constellation of Cassiopeia.
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4 Jovian moons, the Moon's craters and the Milky Way galaxy are discovered
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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
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Piazzi discovers first asteroid, Ceres.
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Johann Galle observes and discovers Neptune.