-Alexandria's Museum included a small observatory where astronomers studied the stars and planets.
-Aristarchus of Samos estimated the sun's size as 300 times bigger than, contrary to popular belief although now changed
-Aristarchus also proposed that the Earth and other planets revolved around the sun
-Ptolemy incorrectly placed the Earth in the center of the solar system, a belief held for 14 centuries.
-Eratosthenes calculated Earth's circumference as 28,000-29,000 miles, close to the modern day calculation of 24,860 miles.
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