The Accuracy of Ancient Cartography Reassessed
The Longitude Error in Ptolemy's Map
Bibliographic Data
| ID | 3558640 |
|---|---|
| Authors | D A Shcheglov (0000-0002-8858-595X, S.I. Vavilov Institute for the History of Science and Technology, corresponding author) |
| Year | 2016 |
| Volume | 107 |
| Issue | 4 |
| Pages | 687-706 |
| Publication date | 2016-12-01 |
| Peer Reviewed | Yes |
| Open Access | No |
| Type | ARTICLE |
| Venue | Isis (JOURNAL) |
| Journal identifiers | ISSN: 0021-1753 • E-ISSN: 1545-6994 |
| Publisher | University of Chicago Press (PUBLISHER • US) |
| DOI | 10.1086/689763 |
| PMID | 29897708 |
| OpenAlex | W2558145557 |
| Language | EN |
| Citations received | 4 |
| References cited | 7 |
This essay seeks to explain the most glaring error in Ptolemy’s geography: the greatly exaggerated longitudinal extent of the known world as shown on his map. The main focus is on a recent hypothesis that attributes all responsibility for this error to Ptolemy’s adoption of the wrong value for the circumference of the Earth. This explanation has challenging implications for our understanding of ancient geography: it presupposes that before Ptolemy there had been a tradition of high-accuracy geodesy and cartography based on Eratosthenes’ measurement of the Earth. The essay argues that this hypothesis does not stand up to scrutiny. The story proves to be much more complex than can be accounted for by a single-factor explanation. A more careful analysis of the evidence allows us to assess the individual contribution to Ptolemy’s error made by each character in this story: Eratosthenes, Ptolemy, ancient surveyors, and others. As a result, a more balanced and well-founded assessment is offered: Ptolemy’s reputation is rehabilitated in part, and the delusion of high-accuracy ancient cartography is dispelled
Epistemology · Geography · Ptolemy's table of chords · Scrutiny · Classical Antiquity Studies · Classics · Historical Astronomy and Related Studies · Historical Geography and Cartography · History · Philosophy
| Unique citing works | 4 |
|---|---|
| Citations per year | 1 |
| Citation span | 2022 - 2025 (4) |
| Citation velocity | recent |
| Highly cited | No |
| Citation types | Neutral: 4 |