Don Quichotte, please stop making stuff up.
On a flat Earth, when the sun, or other celestial object, is directly overhead, it's light is only traveling through a few miles of atmoplane. When it is at a significant angle, the light must pass through thousands of miles of atmoplane. Do you need for me to draw you a diagram? Can you really not understand this?
Thanks, jroa. But I think what you are saying is that the moon and the sun are only 3000 miles from the earth in FE Theory ?
Ahem ! IMHO my question is. : Just who is "making stuff up" ? Don Quichotte or jroa ?
Maybe this is a bad analogy but I'll throw it out anyway .:
If you are looking at the moon, etc. you are seeing
through a relatively thin layer of the atmosphere.
If you are looking at distant objects on land you are looking
across a thicker layer of atmosphere ?
PS- Sorry. I just shot myself in the foot. They don't even make infrared films for amateurs anymore. So much for that suggestion . But....again IMHO....It seems like the Flat Earthers would have done this years ago when the stuff was still available to prove their point. It would have been a prime example for evidence of a Flat Earth. Just like photos of the Ice Ring.