If you go north of the Arctic circle, you can see the sun 24 hours a day near the summer solstice. This seems consistent with both round and flat earth models.
If you go south of the Antarctic circle, you can see the sun 24 hours a day near the (southern) summer solstice. This seems inconsistent with a flat earth model. How can you see the sun 24/7 in the south, when the sun is so much farther away on any of the flat earth maps?