Empirical Earth · Test It Yourself
The claim
“The Sun is small and close, a few thousand kilometers overhead, and nobody has ever measured its distance. The 150-million-kilometer figure is an assumption, not an observation.”
What is measured
The scientific method is a loop: notice something, guess why, work out what that guess demands, then go and check. Keep only the guesses that survive the checking. Run that loop on the shape of the Earth and it returns a sphere, every time, from every direction you approach it.
What would show this is wrong
any step above whose Earth example cannot be carried out as described. Each one links to an entry where that measurement is made; if the measurement does not return what the step claims, the walk-through is wrong at that step. The method is only as good as the checks it points to, and every check here is a live link.
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.