>>>Why does it matter whether you're consistently going south or not? Even if you're not in Antarctica because the Forces-That-Be fooled you somehow, you're still somewhere on Earth with a 24-hour sun.

If you're somewhere on Earth with a 24 hour sun, but it's not anywhere near where the scientific establishment says the 24 hour sun should be, I don't think you'd jump to the conclusion that the standard scientific model of a round earth is correct...