How as an individual can I know if the Earth is a sphere or a flat disc? What experiment can I do that doesn't involve trusting information from a 3rd party that would prove what the geometry really is?
you definitely confused me because before I read this topic I had the thoughts about the earth is really in sphere shaped but after that my mind also think we can be a flat round shape.All of these models have been proven wrong many times over.
3D is flawed, its the same as saying there is only 10 numbers because you cant see the 11th finger.
Learn 4 D
https://www.youtube.com/watch?v=iGO12Z5Lw8s
https://www.youtube.com/watch?v=eyuRLmCphHc
https://www.youtube.com/watch?v=_4ruHJFsb4g
https://www.youtube.com/watch?v=eGguwYPC32I
4D Roller Coasters: Explained
And the sell-out Carl Sagan