This video from a high-profile skepticism channel perports to debunk a flat-Earth nut. But, Greg’s explaination of why the artificial horizon instrument on an aircraft works properly seems to me to be horribly wrong. In fact, I think the nutjob has it right in terms of how a bare isolated gyroscope would appear: The plane, travelling far enough to go over the curve of the Earth, would turn around a gyroscope that naturally keeps its axis true relative to the “fixed stars”. And a supported gyroscope would feel presession as the framework holding it was turned.
Can someone knowledgable confirm this?
And please comment on the video too: it will take some traffic to Be noticed over the background junk comments and this is a serious teaching site normally of high quality, so it should be brought to his attention from proper authority.