Geographical Latitudes in Eratosthenes, Hipparchus and Posidonius

@article{Diller1934GeographicalLI,
  title={Geographical Latitudes in Eratosthenes, Hipparchus and Posidonius},
  author={Aubrey Diller},
  journal={Klio},
  year={1934},
  volume={27},
  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
New controversies on Columbus' “cosmographic” ideas
On the basis of modern works of a Spanish paleographer, a North American geographer and, a historian-sailor, also North American, respectively, we have reexamined some controversial aspects of theExpand
An analysis of the latitudinal data of Eratosthenes and Hipparchus
The handed down latitudinal data ascribed to Eratosthenes and Hipparchus are composed and each tested for consistency by means of adjustment theory. For detected inconsistencies new explanations areExpand
Crates of Mallos and Pytheas of Massalia: Examples of Homeric Exegesis in Terms of Mathematical Geography
Crates of Mallos, a Hellenistic grammarian and geographer, is known to have combined Homeric exegesis and mathematical geography into a comprehensive world-view. His views appear to have influenced aExpand
On the making of Ptolemy’s star catalog
  • C. Marx
  • Mathematics
  • Archive for History of Exact Sciences
  • 2020
The assumption that Ptolemy adopted star coordinates from a star catalog by Hipparchus is investigated based on Hipparchus’ equatorial star coordinates in his Commentary on the phenomena of AratusExpand
Appendices and Indices Figures and Plates
The most essential requirement for any measuring unit is its constancy. In historical chronology, however, this condition is satisfied only in three cases: by the Egyptian years of 365 days, by theExpand