I almost fell into that flat earth stuff but most of it is rather silly once u reach a different level of understanding of things.
"Have you ever felt yourself spinning, like 1000 mph?" - we only feel acceleration or deceleration. When you sit in a car that is driving in constant speed in a smooth road you dont feel any movement at all.Take-off and braking -thats what you feel.
"Have you ever seen water cling to a concave surface?" - ive never seen a waterdrop that is shaped like a cube .There is pretty much nothing that is "flat" in the universe . Or if you think something is flat then put it under an microscope and take a look from another perspective.
Just because railroad tracks seem to get closer to each other doesnt mean they meet behind the horizon...
"Have you ever looked at the stars with a zoom camera like the Nikon P-900?" - do they expect to see a 4k picture ? Looking at things through couple hundred kilometers of atmosphere is like watching something through gaz fumes.Different layers of atmosphere refract light differently,it's like watching through multiple filters that all keep moving all the time.
en.wikipedia.org
All light you have ever seen is refracted. You cant see "pure" light with your eyes.That electromagnetic spectrum is for the soul to see ,which would be white light of stillness. Light does not move as it is an wave and waves are propagation in the medium. A "shockwave" if it helpts to imagine it better.
And with that firmament thing i dont agree at all .If there was firmament then we would have no UV-spectrum .Thin layer of glass wont let through UV (you cant get suntanned through the window).So the sun cant be on the other side of it .There are pretty decent telescopes out there with hydrogen-alpha filters , you can watch sun all day long as long as it aint cloudy.That damn thing is pretty far.
I suggest to listen what Eric Dollard has to say about sun (his other stuff is also top notch).
And that 1958 Encyclopedia video seems to be describing lands topography .Big area covered in snow,shaped like a dome-not very hard to believe.And that dome is 13 000 feet high ? 13 000 feet is 3900 meters ." Antarctica has the highest average surface elevation of all the continents at around 2000m above sea level.Highest mountain in Antarctica is 16,050 feet (4,892 meters)"