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2500 BCE
Building of Stone Hedge
Alignments of stones mark the rising and setting points of the sun. -
2000 BCE
Lunar Eclipse
Oldest known lunar eclipse observed at Ur in Mesopotamia over 400 years ago. -
580 BCE
Anaximander
Describes his model of Earth, Sun, Moon, and stars -
250 BCE
Eratosthenes
Eratosthenes finds the circumference of the Earth -
1 BCE
Medicine Wheel
Plains Indians of North America built medicine wheel -
140
Geocentric Model
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. -
Sep 30, 1054
Crab Nebula
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 -
Oct 3, 1066
Comet Halley
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. -
Oct 3, 1200
Development of Astronomy
aided by the birth of universities at bologna, oxford, paris, and a few others European cities -
Oct 3, 1265
Roger Bacon
bacon was among the first to recommend experimentation as the best way to acquire scientific knowledge -
Oct 3, 1300
Dantes picture
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 -
Oct 3, 1330
Jean Buridan
Jean Buridan develops imperus theoryof motion.