If you mean horizon as in a "horizontal earth service, to which your plane might not be parallel to", Flat Earth is more compatible with horizon than a spherica

If you mean horizon as in a "horizontal earth service, to which your plane might not be parallel to", Flat Earth is more compatible with horizon than a spherical Earth. If you mean "where the sky meets the ground far away", it's a finite distance away but maybe you can't ever reach the end, perhaps due to increasing drag force the closer you get to the edge, and a curved prism that distorts optics. If you allow natural forces to vary with distance from the edge of a disk, you can probably recovery most spherical phenomena. There's a sort of equivalence between static geometry models and dynamic force models.