FURTHER PROOFS OF THIS. -- That the earth also has a bulge from north to south and vice versa is shown thus: To those living toward the north, certain stars are always visible, namely, those near the North Pole, while others which are near the South Pole are always concealed from them. If, then, anyone should proceed from the north southward, he might go so far that the stars which formerly were always visible to him now would tend toward their setting. And the farther south he went, the more they would be moved toward their setting. Again, that same man now could see stars which formerly had always been hidden from him. And the reverse would happen to anyone going from the south northward. The cause of this is simply the bulge of the earth. Again, if the earth were flat from east to west, the stars would rise as soon for westerners as for Orientals. which is false. Also, if the earth were flat from north to south and vice versa, the stars which were always visible to anyone would continue to be so wherever he went, which is false. But it seems flat to human sight because it is so extensive.
1. This assumes that stars and heavenly bodies are high enough in the sky that everyone should see them. It could be that they are LOWER than we think, which explains why the vast spread of land cannot see everything at the same time.
2. There may be a slight bulge from north/south and east/west. But this does not prove the earth's land curves in a spherical way.
3. Flat Earth does not mean completely flat. We know there are variations in altitude, sea level, etc. Not every inch of land is at sea level, nor is it completely flat everywhere.