Distances can be seen on the earth that should not be allowed by the curve. Here are some world record sighting distances that defy the supposed curvature of the earth:

https://beyondrange.wordpress.com/

Plug this data into https://dizzib.github.io/earth/curve-calc/?d0=30&h0=10&unit=imperial and you can find that these mountain ranges should be hidden behind the horizon.

The argument I see so often for this is that it is atmospheric refraction. Yet there is an observation that proves this can not be the case. The sun's apparent size in the sky is the same at noon as it is at sunrise/sunset. Since they are the same size, this shows that there is no atmospheric refraction occurring, because if the atmosphere were in fact refracting it would enlarge the sun towards the horizon due to a higher angle of incidence through the supposed spherical atmosphere.

https://en.wikipedia.org/wiki/Snell%27s_law

Thoughts?`