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Does anyone who's ever seen a sunrise or sunset actually believe this? And if so, how?

It's just a model. It makes more sense than a globe, but again it is a fallacy to try and infer the shape of the Earth from looking at the sky (unless you can demonstrate their relation)

You can determine the relative position between the ground you're standing on and an object in the sky by looking at it. That's enough to invalidate models that are clearly wrong about the relative position of the sun at sunset, such as this one.

It may be possible to create a flat-earth model of how the sun works that explains time zones and seasons while also allowing for sunrises and sunsets. If it's not, then that's the other premise we need to start inferring facts about the shape of the Earth from looking at the sun. I don't really care to try that now, I'm just dunking on a particularly ridiculous model.

I know a flatearther who used satellite broadband to do research on flat earth, even though that very same research was telling him, space is fake, gravity is fake , satellites are fake, and so on, yet somehow his broadband worked fine, and he paid for it..