What observations can a person do to prove the earth is a certain shape?
Now there’s plenty of observations a person can do in the real world to prove the earth is a sphere. For example, seeing a boat disappear bottom up over the horizon.
However one thing that would be pretty cool is what if the earth was for example flat? What observations could a person do to prove that the earth is flat?
I won’t just limit it to just being flat, what observations could a person do to prove the earth is a cube, a triangle, and so on and so forth.