FYI, diehard FE'ers will not be impressed by that argument. They typically claim that this happens because of some optical effect that I cannot remember the name of atm.
4. Lots of other proofs that do not fit the narrative that is being pushed here, so they are ignored. For example analyzing night sky movement pattern with math.
This may not look very persuasive, but what we see is quite impossible on a flat earth unless every observer is fed his own separate image tailored for his latitude/longitude.