Can you at least agree that the sun is a flaming ball of plasma? Because if you can't, I'm done talking to you. Assuming that you beleive this, then you know that if the sun was low enough that it was within the "firmament," the air around it would become super heated. This would make it turn to plasma, until eventually everything was so hot that it was plasma. Soon, we would burn to death with nowhere to run, nowhere to hide, and no hope at all.