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the surprising thing is
that most students think that
the radius of the Earth is very recent knowledge (most think it is less
than 500 years old)
earth was flat if Eratosthenes
got it right ( or close enough) over 2000 years ago. From what I was
able to gather, the belief that the earth is flat is mostly a legend
invented in the 19th century as a put down of the medieval people
(Washington Irving is often mentioned as the main culprit).