I'm honestly surprised that you dismiss my explanation so quickly as a "personal anecdote". If you live in the continental US, you can see it for yourself, next summer. At either sunrise or sunset, note the first/last location in which you see the sun. That location, relative to your location, will be more to the north.
Although I can't demonstrate it, I can describe it. Get yourself a globe model, and put a marker at any point outside either Tropic. Tilt the globe roughly 23 degrees towards a bright light, and rotate it until the light just barely reaches that point, to simulate "sunrise" or "sunset" during the summer for that hemisphere. Then look "from" the point toward the light and note the direction on the globe in which you are looking. It will be outside the Tropic as well.
I don't own a globe so I can't take a picture for you, but the following image may help. In this image, the southwestern tip of Australia is about to experience "sunset". A straight line from that location toward the sun is analagous to the direction in which a person in that location would look to see the sun. The sun would be perceived to be southwest of that location. On the north-centric flat earth model, from that location, the sun would
always appear to be "north" (northwest, northeast) of that location.
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