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According to Diller (1949), 1 stade could be anything between about 150 and 200 m. Thus, 400 000 stades is somewhere between 60 000 and 80 000 km. The Earth's circumference is actually about 40 000 km.

Actually the difference in latitude between Aswan and Alexandria is slightly less than Eratosthenes' value, and there is a difference in longitude of approximately 3°. Eratosthenes' original work on the measurement of the Earth is lost and our knowledge of his technique comes from a number of later sources, notably Cleomedes, a popular writer on astronomical matters. There has been much debate about the precise details of Eratosthenes'

Eratosthenes is credited28 also with measuring the obliquity of the ecliptic,

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