I write: << A rutter is a sea journal that keeps East-West coordinates. The could not make accurate global charts without trigonometry and 3 dimensional calculations, with the initial assumption that the Earth is a globe. >>
But they travelled on land, you say? Sure, but they knew latitude exactly. So they travelled along the line of latitude and proved that their cartography in their rutters did not form exact squares. And they built the first pyramids 4000 BC, perfectly square, and apparently so only from the air, so that they could test for astronomy in astronomic visitors. That shows that, the world is round, the world is not flat and sectionable by squares, and that the stars indicate suns and that the earth revolves around a star which is similar to our solar system, and therefore similar beings might exist on similar globes around those stars. 6000 years ago by the Egyptians in Africa.
