One issue with the flat earth thing is with gravity. In order to work out the gravitational field created by a hypothetical solid at a given point, you divide up the solid into n cubes, calculate the field vector from each cube, and add them together.
Because there is equal mass either side of a person on the surface of a sphere, the gravitational field is vertically down (ie. all horizontal components of all cubes add to zero).
In the case of an infinite plane, this would also be the case.
However David Chase Taylor proposes a disc model (like a discus) where at 6 points this would be true, but otherwise there would be an uneven mass either side of the person on the surface. Objects wouldn't fall directly down but at an angle.
The infinite plane thing is wrong because we can see ship sails before the bottom of the ship as the boat comes over the horizon. Hence we know earth is curved.
Because there is equal mass either side of a person on the surface of a sphere, the gravitational field is vertically down (ie. all horizontal components of all cubes add to zero).
In the case of an infinite plane, this would also be the case.
However David Chase Taylor proposes a disc model (like a discus) where at 6 points this would be true, but otherwise there would be an uneven mass either side of the person on the surface. Objects wouldn't fall directly down but at an angle.
The infinite plane thing is wrong because we can see ship sails before the bottom of the ship as the boat comes over the horizon. Hence we know earth is curved.