Is the curve of the earth perceptible by looking at the horizon?
The oldest way to prove that the earth’s horizon is not flat is to do the old sailing ship on the ocean thing. The horizon IS curved, since the planet IS a ball floating in orbit around the sun. The way to see this is to watch a sailing ship either approaching or leaving. Better if it’s approaching. You’ll see the tops of the sails first, gradually seeing more and more of the ship as it approaches you. Another way to determine the curve of the earth is to map the positions of various shadows (in different locations) at noon. If you map the shadow, or absence of a shadow of a skyscraper at noon, with the sun directly overhead, you’re not going to get the same type of shadow mapped at from a skyscraper in another country or city far away from you (preferably one still experiencing daylight.) As for whether or not you can see the curve of the earth this way, the answer is no. But I HAVE actually seen the curve of the earth by watching the sun rise from a transatlantic flight. So if you re
