Ptolemaic Projection
Back to people overviewA projection created by Ptolemy (c100-170CE). Combining two classical concepts: “oikoumene”, or the “known world”, Eratosthenes’s (c240 BC) calculation that the circumference of the earth was 39,690 km; and Marinus of Tyre’s (c70-130AD) idea of a network of meridians and parallels on which to plot coordinates. This enabled the projection of the geographic coordinates of about 8,000 places.
![Ptolemaic Projection of a world map set against a blue sky, surrounded by clouds and 12 Windheads](https://cdn.sanity.io/images/foan2pfl/production/e78ac06a8389d9a79c1da221433f2ac952f8e8d9-4724x3405.jpg?w=3840&q=85&auto=format)