Thank you so much Clete, great answer, clearly stated.
First, I don't how often the city is seen from over 50 miles away. The photographer, Joshua Nowicki, would probably be a good source for that. But the amount of times it occurs is not the issue to me, or to flat earth arguments. Here is how the FE argument goes.
Seeing anything at distances we are not supposed to see them at, because of the curvature of the earth, is at the heart of the flat earth movement.
When one sees a right side up image that should not be visible it's evidence/proof the earth is flat and not curved.
Globe Earth Answer: What we are seeing is not the real thing but only an image of it because of refraction. A refraction happens when warm air passes over colder air. The image is projected over the actual thing, as illustrated below.
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Flat Earth Objection: But then what are we seeing when we see an upside down image over an upright image of what is actually hidden behind the earth's curvature, as illustrated below?
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Globe Earth Answer: That's a mirage, a reflection of the what you cannot actually see. It's also produced when warm air passes over colder air.
Flat Earth Question: How come we get two different effects from the same atmospheric condition, warm air over colder air?
Please explain.
The answers from globe earth, as I see it, involve the fallacies of circular reasoning and equivocation. When one word, refraction in this case, can be used to mean more than one thing, we will not get a coherent answer when we object to a contradiction in an argument being made that in incoherent.
--Dave