aug 24, 271 BC - Greek mathematician and geographer Eratosthenes
Description:
proved that the Earth was round, and made a remarkably accurate calculation of its circumference and its tilt (as well as devising a system of latitude and longitude, and, possibly, estimating the distance of the Earth from the Sun).
Added to timeline:
HPS Project
"History of Physics"
Members: Jerby E. Romero
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