Mate, it's not hard, I showed you a simple diagram that proves you will get a sunrise/sunset on a sphere, whether we're standing on one now or not was completely irrelevant. You said it was impossible without moving your head
You're wrong, 100% wrong, I just proved you wrong.
You're not into science, you're into a version of religion, you don't care about the evidence, you just believe.
He has taken the stance that your line of sight is infinitely narrow and has no field of view, therefore (if this was the case) you would need to move your head to follow the sun tracking downwards over the horizon. However, this isn’t how our sight works, but he will willingly argue a ridiculous point in order to ‘prove’ another.