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Alignments of stones mark the rising and setting points of the sun.
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Oldest known lunar eclipse observed at Ur in Mesopotamia over 400 years ago.
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Describes his model of Earth, Sun, Moon, and stars
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Eratosthenes finds the circumference of the Earth
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Plains Indians of North America built medicine wheel
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Ptolemy "perfects" geocentric model of solar system. in Ptolemy's model the planets moved on circles (epicycles) that moved on other circles (deferents). the model could accurately predict the positions of the planets. ptolemy also compiled a catalog of stellar brightnesses based partly on the earlier catalog of Hipparchus.
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Chinese record supernova that produces Crab Nebula. Chinese astronomers observed a supernova that was visible in the daytime. the matter blasted outward by the supernova later became observable as the Crab Nebula
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the appearance of the comet in 1066 was considered an ill omen for Harold, king of England. Later that year Harold was killed in the Norman invasion of England.
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aided by the birth of universities at bologna, oxford, paris, and a few others European cities
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bacon was among the first to recommend experimentation as the best way to acquire scientific knowledge
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dantes picture of the universe has the Earth at its center, surrounded by the spheres of the moon, sun, planets, the fixed stars, a crystalline sphere, and finally paradise
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Jean Buridan develops imperus theoryof motion.