Intrepid explorer Christopher Columbus didn’t have the know-how to accurately measure longitude, and never sailed to the west coast of South America, yet the Waldseemuller Map of 1507, a map of nearly all the world, shows South America in its proper longitudes, both the west and east coasts too, and the continent squeezed laterally, at the edge of the map like it would appear to the eye looking at a globe of the earth, proving that some of the ancient source maps for the Waldseemuller were drawn by navigators who’d been there, accurately measuring and mapping according to the precession rate of the earth’s axis, 72 years/degree (see Page titled Great Pyramid for Navigation).