Somehow I stumbled upon a short video of a helicopter hovering and I got stumped.
Helicopter is not touching the ground. Earth is spinning. Yet Helicopter is staying in place. No fancy GPS is used to stay in one spot.
Apparently something to do with air molecules keeping it in place... but that alone isn’t sufficient to explain this.
Are we saying that as long as the universe is filled with air or some sort of gas, Helicopter can take off to infinity and return back to same spot infinite time later?
There has to be some sort of a point where helicopter is far enough away from earth whereby earth’s spin has to matter? What is it?