Curvature of horizon?
Apologies if this isn't quite the right forum to ask this question, but I suspect military aviators may be best placed to come up with an answer.
I've recently been re-reading 'Night Fighter' by C F Rawnsley and Robert Wright, which to my mind is a classic of aviation literature. In one of the chapters Rawnsley describes a high-altitude test flight in a Mosquito XV, and seems to imply that from 43,000ft he could see the curvature of the earth ("It was the first time that I had seen for myself that it really did curve, and that the earth was round").
The highest I've ever been was 47,000ft in a Hunter (on a gin-clear day over South Wales) and whatever flight levels 747s and the like habitually attain. However, on no occasion have I been aware of seeing curvature of the horizon, and a bit of mathematics suggests it's unlikely. Any FJ folks who've been there care to comment?
John