North wasn’t always “up” on world maps. North doesn't always mean "up" when it comes to geophysics. Scientists have known for ...

Ptolemy’s book also provided a written description of how to draw world maps, using a grid of intersecting lines known as a graticule. He also invented two map projections. Ironically ...

Columbus carried a map influenced by the ancient Roman’s work. But Ptolemy thought the world was 30 percent smaller than it actually is; worse, the mapmaker was using Arabian miles, which were ...

Although Ptolemy’s calculations were inaccurate—leading to distortions in distances—he was the first to use mathematics in cartography. Certain aspects of his world map, like his successful ...

As Jerry Brotton writes in A History of the World in 12 Maps, Claudius Ptolemy’s remarkably comprehensive Geography — completed around 150 A.D. — “would come to define mapmaking for the next two ...

Egyptian scholar Claudius Ptolemy—known as the “inventor ... (Here’s why your mental map of the world is (probably) wrong.) Helen Sunderland-Cohen, who manages the Oculi Mundi collection ...

A guide for Columbus Some of the maps came from the 1482 book "Cosmographia" and "Geographia" (1507), based on the work of Ptolemy. World maps by the Greek master were used by travelers for ...

The ancient Greek astronomer and geographer Ptolemy of Alexandria drew a map of the world in the 2nd century, which shows the stone fort as one of only five Irish sites to be noted. The Grianan ...

Columbus carried a map influenced by the ancient Roman’s work. But Ptolemy thought the world was 30 percent smaller than it actually is; worse, the mapmaker was using Arabian miles, which were ...