TB-xx8vj Flerf/bevvite ?

37,000 feet up requires a horizontal reference plane (flat earth). At best, you just proved earth is measured flat.

you can't have level on a globe. Level is a horizontal plane with no point higher than another. A globe curves away from horizontal. No longer can you use a flat earth and imagine a globe.

The horizon has 0 slope. Horizontal is parallel to the plane of the horizon at right angles to vertical.

It's really weird that you keep asking me about tides when I have not made any claims about tides.

A 24-hour sun in Antarctica doesn't have anything to do with the ground being measured flat. Just another red herring.