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Asian hunter-gatherers had crossed over the frozen Bering Strait to become first humans in North America.
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First solar-lunar calendars
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Earliest records of Greek, the earliest records of any European language
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Trojan War
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Aristarchus suggests the Earth revolves around the Sun. He provides first estimation of Earth-Sun distance.
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Introduction of the Julian calendar, a purely solar calendar, to the Roman Empire.
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The Crusades
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Copernicus publishes his heliocentric theory of the Universe.
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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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The discovery of Uranus by Herschel
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Johann Galle observes and discovers Neptune. His observations were prompted by mathematical calculations by French astronomer Joseph Leverrier and English astronomer John Couch Adams.
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Asaph Hall discovers Phobos and Deimos, the moons of Mars.
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Albert Einstein introduces special Theory of Relativity in paper Electrodynamics of Moving Bodies.
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Sputnik, first object to orbit the Earth, launched by the Russians
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The Big Bang probably occurred
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Asaph Hall discovers Phobos and Deimos, the moons of Mars.
