[philman_36]

The curvature of the Earth limits how far binoculars can extend observation of the surface...
You obviously don't grasp that the vanishing point applies to binoculars as well as to our eyes. THAT, not the curvature, is what limits the binoculars.

Atmospheric conditions affect the visibility.
...transient atmospheric conditions can reduce it.

You're telling me something I already know?

[SunkenCiv]

Keep talkin’. You make yourself look more and more dopey as you go.