Go outside

It’s that simple. Go outside. Look as far as you can, and make sure nothing is blocking your view and that you can see the horizon. You like to say “I shouldn’t be able to see this, but I can, so the Earth is flat!”. But why can’t you see, say, the Eiffel Tower from Dallas, Texas? The Earth is flat, right? So you should be able to see infinitely far. Squint your eyes, try and see it.

It’s that simple. Go outside. Look as far as you can, and make sure nothing is blocking your view and that you can see the horizon. You like to say “I shouldn’t be able to see this, but I can, so the Earth is flat!”. But why can’t you see, say, the Eiffel Tower from Dallas, Texas? The Earth is flat, right? So you should be able to see infinitely far. Squint your eyes, try and see it.

I think you need a new username. The one you have chosen is pretty lame. Or maybe you accidently put your usual password as your username. Oops

In answer to your question that has been answered a million times already, fog, haze, pollution etc, all eventually cloud the view over long distances.

Also, how far can you see through fog? Can you guarantee clear weather all the way from Dallas to Paris?

It’s that simple. Go outside. Look as far as you can, and make sure nothing is blocking your view and that you can see the horizon. You like to say “I shouldn’t be able to see this, but I can, so the Earth is flat!”. But why can’t you see, say, the Eiffel Tower from Dallas, Texas? The Earth is flat, right? So you should be able to see infinitely far. Squint your eyes, try and see it.

Your indignation and condescension lose a lot of punch when your argument is so stupid. Eiffel Tower is 1000 feet tall. Just for jollies let's say flat earthers think Dallas to Paris is 1000 miles (it's 5000, but let's be generous).

1000 feet at 1000 miles is the same angular extent as 1 foot at 1 mile. Are you seriously telling me that you could see, much less identify, a needly iron spike a foot high from one mile away?

If you're gonna "hey, dumbass" someone with an argument, make sure the argument doesn't make you look like a bigger dumbass.