Flattardian Bob Accidentally Proves Earth's Rotation With $20,000 Gyroscope

Credit - https://www.youtube.com/watch?v=SVvf617ReVs

In the documentary “Beyond the curve”, a flat earther is unhappy with his measurements of earth’s rotation.

Flat earther Jeran's problems with his detection of earth's curvature: • Flat earther accidently proves earth'... https://www.youtube.com/watch?v=RapVrOQwv8o&t=0s
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: • Flat Earth: 2 Tests and a Documentary https://www.youtube.com/watch?v=nW_lIPdsWjY&t=0s
See how Bob Knodel was exposed lying about his flight license: • Did this Flat Earther lie about being... https://www.youtube.com/watch?v=JjqOzimCz7A&t=0s

If you are a flat earther: nope, the earth is not flat! You can clearly see the curvature in undistorted (!) amateur footage:
https://imgur.com/a/vGrZssA
https://imgur.com/a/RacViFN
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=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:
https://imgur.com/a/xLfRI8M
https://imgur.com/a/ctodmDn
https://imgur.com/a/1kAufSm
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:
https://imgur.com/a/SJhnjQt
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: • eotvos en https://www.youtube.com/watch?v=3ushpbbP2H8&t=0s

All flat earth claims are debunked. See this debunking of Dubay's "200 proofs", for instance: • Debunking 200 "Proofs" for a Flat Ear... https://www.youtube.com/watch?v=jzeXFGgCMFI&list=PLGSTO75_3Rv_gvv4rPK8VUfBypyBhgWn0&index=1&t=0s