^^^ Well, I don't have to ask why you refuse to acknowledge that the horizon is crated by the angular resolution limit of the "eye" being used; Earth curvature falsified....
>>> garbage pictures deleted
There could be multiple reasons why the horizon is seen by the eye.
A) earth curvature
B) hilly terrain
C) rising terrain
D) massive clouds of locusts or angry bees creating an apparent horizon
E) In the ocean while sailing, synchronized jumping of millions of fish into the air at the same time
F) A giant tsunami coming toward you hundreds of feet high, either on land or water
G) Massive flows of molten lava from deep underground create a horizon that moves toward you that you want to move away from
H) A giant mess of dirt and former civilization coming toward you, formed by the impact of a 300 meter wide asteroid a thousand miles away.
But this one is my favorite.
I) Place a row of girls in bikinis some distance away, and however far away they are, 5, 10 50 or 100 feet, that's the horizon.
None of these involve the angular resolution limit of the human eye.
....Do all three sides of a triangle add up to 180 degrees, hell yes....
What if you measured the three corners and they didn't add to 180? What would you do?