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Dionysodorus of Amaseia (Ancient Greek: Διονυσόδωρος ο Αμασιεύς, 1st century AD) was a Greek mathematician from Amaseia in Pontus.
Pliny the Elder, who lived during the same era, mentions that Dionysodorus calculated the circumference of the Earth and found it to be 42,000 stadia - a value significantly different from the larger and more accurate measurement of Eratosthenes in the 3rd century BC, which was 252,000 stadia, regardless of the value of the stadium used. There is often confusion between Dionysodorus of Amaseia and Dionysodorus of Caunus, who studied conic sections.
References
- "Eratosthenes and the Mystery of the Stades - How Long Is a Stade? | Mathematical Association of America". www.maa.org. Retrieved 2023-12-07.
- "Dionysodorus biography". www-groups.dcs.st-and.ac.uk. Archived from the original on 2006-05-11. Retrieved 2023-12-07.
- "Dionysodorus – Dictionary definition of Dionysodorus | Encyclopedia.com: FREE online dictionary". www.encyclopedia.com. Retrieved 2023-12-07.
- Hardouin's commentary in Lemaire, Volume 1, Page 469 Aliter, inquit, et cautius multo Dionysodorus est audiendus, qui miraculo solo nititur, quam Hipparchus et Eratosthenes, qui geometricis nituntur principiis
Bibliography
- Hardouin's commentary in Lemaire, Volume I,
- Hardouin's Index of Authors in Lemaire, Volume I, Page 123
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