E
There's a modern way to personally no that the world is round though it cost some money to do this but if one takes a Plane climbs to 50,000 feet and fly 360 degrees in all directions one at a time look out the window at the horizon it should be in a simi circle you can see the curvature of the earth (that's what I saw from inside a plane has anybody else flown? And saw this)now keep flying in a straight line until your back at your original point were you start back home in general fly around the earth if you don't come back to were you started from then It may not be round but if the curvature of the earth never changes from a simi circle for the whole journey then the world is round a sphere. And also the miles should be the same in any direction.