Geographical Latitudes in Eratosthenes, Hipparchus and Posidonius

  title={Geographical Latitudes in Eratosthenes, Hipparchus and Posidonius},
  author={Aubrey Diller},
  pages={258 - 269}
Our knowledge of the ancient measurements of the size of the earth comes chiefly from a Schoolbook of the second century, Cleomedes On the Orbits of the Heavenly Bodies, which gives (I 10) an account of two separate measurements, by Eratosthenes and by Posidonius. According to Cleomedes, Eratosthenes derived the circumference of the earth from the arc of a meridian between Alexandria and Syene, which he found to be 1/50 of a circle and 5000 stades in length: 50 X 5000 = 250000. Posidonius used… Expand
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On the making of Ptolemy’s star catalog
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  • Archive for History of Exact Sciences
  • 2020
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Appendices and Indices Figures and Plates
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