All rights belong to Netflix, no copyright infringement intended. In the documentary “Beyond the curve”, a flat earther is unhappy with his measurements of earth’s rotation.
Flat earther Bob’s problems with his measurement of earth’s rotation: https://www.youtube.com/watch?v=SVvf617ReVs
Flat earther Jeran’s problems with his detection of earth’s curvature: https://www.youtube.com/watch?v=RapVrOQwv8o
Of course, both flat earthers claim that the documentary was deceptive. Of course, they’ve both lied when making up excuses. See this analysis from Sly Sparkane: https://www.youtube.com/watch?v=nW_lIPdsWjY
See how Bob Knodel was exposed lying about his flight license: https://www.youtube.com/watch?v=JjqOzimCz7A
If you are a flat earther: nope, the earth is not flat! You can clearly see the curvature in undistorted (!) amateur footage:
Since the curvature is consistent, regardless of the camera’s angle, it’s proved that the curvature is not due to a fisheye lens. The overlay shows the theoretical expectation on a sphere with earth’s radius, calculated with Walti’s horizon app: http://walter.bislins.ch/bloge/index.asp?page=Flat%2DEarth%3A+Finding+the+Curvature+of+the+Earth
The observation and the expectation match very well.
Flat earthers claim that the horizon is “always at eye level”, which is, of course, not true. Independent measurements clearly prove the drop of the horizon:
The white cross indicates the eye level; the horizon is clearly below. Again, the overlaid expectation matches very well with the observation.
The effects of the curvature in the line of sight can be seen when zooming:
In their “experiments”, flat earthers ignore atmospheric refraction, which tends to increase the maximum viewing range. This is a well-known effect. And no, the curvature has nothing to do with perspective or “atmospheric lensing”, as some flat earthers say. In fact, all flat earth videos regarding “atmospheric lensing” are frauds, since they always look through the lower part of their magnifying glass, where they should look through the upper part in order to simulate atmospheric refraction.
Earth’s rotation can easily be proved: a testmass weighs less when flying with earth’s rotation, as can be seen here: https://youtu.be/3ushpbbP2H8
All flat earth claims are debunked. See this debunking of Dubay’s “200 proofs”, for instance: https://www.youtube.com/watch?v=jzeXFGgCMFI&list=PLGSTO75_3Rv_gvv4rPK8VUfBypyBhgWn0