The Two Earths of Eratosthenes

@article{Carman2015TheTE,
  title={The Two Earths of Eratosthenes},
  author={Christi{\'a}n C. Carman and James Evans},
  journal={Isis},
  year={2015},
  volume={106},
  pages={1 - 16}
}
In the third century b.c.e., Eratosthenes of Cyrene made a famous measurement of the circumference of the Earth. This was not the first such measurement, but it is the earliest for which significant details are preserved. Cleomedes gives a short account of Eratosthenes’ method, his numerical assumptions, and the final result of 250,000 stades. However, many ancient sources attribute to Eratosthenes a result of 252,000 stades. Historians have attempted to explain the second result by supposing… 
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