Empirical Earth · Space, Satellites & the Edges of the Map
The claim
“Satellites and the ISS are CGI — nobody can actually see them.”
What is measured
The ISS is the third-brightest object in the sky, crossing on a schedule NASA publishes for your coordinates; amateurs worldwide photograph it, including its silhouette transiting the Sun and Moon, with gear NASA never touches.
What would show this is wrong
a published ISS pass that fails to appear on time; or independent transit photographs that cannot be reconciled with an object in orbit; or a carrier on 145.800 MHz that arrives and leaves at the same frequency, with no Doppler slide. That last one needs a twenty-dollar radio and one clear evening, and anybody can run it.
Sources
This is one card from Empirical Earth, a free reference that states each flat-Earth claim at its strongest and then answers it with sourced measurements. Nothing is for sale and there are no advertisements.