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280 BCE
270 BCE
260 BCE
250 BCE
240 BCE
230 BCE
220 BCE
210 BCE
200 BCE
276 BCE - 195 BCE: Life of Eratosthenes, ancient Greek Alexandrian scholar, native of Cyrene and one of the greatest geographers in antiquity.
240 BCE: Eratosthenes calculates the earth's cirumference based on the difference in shadows at midday at two different locations in Egypt.