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Based on the discussion of Eratosthenes' method in Daniel Špelda's Astronomie v Antice (Astronomy in Antiquity, ISBN 80-7225-210-0), the distance of 5000 stadia was estimated by Eratosthenes based on the time traders took to travel between the cities. A round value was used, similar to other values Eratosthenes used in his computation, suggesting that even ...