Of paths and places: the origin of Ptolemy’s Geography

@article{Grasshoff2017OfPA,
  title={Of paths and places: the origin of Ptolemy’s Geography},
  author={Gerd Grasshoff and Florian Mittenhuber and Elisabeth Rinner},
  journal={Archive for History of Exact Sciences},
  year={2017},
  volume={71},
  pages={483-508}
}
In his Geography, Ptolemy recorded the geographical coordinates of more than 6,300 toponyms of the known oikoumenē. This study presents the type of geographical information that was used by Ptolemy as well as the methods he applied to derive his geographical coordinates. A new methodological approach was developed in order to analyse the characteristic deviations (displacement vectors) of Ptolemy’s data from their reconstructed reference locations. The clusters of displacement vectors establish… 
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