Posted: Feb 29, 2020 10:58 am
by Hermit
OlivierK wrote:
Yes, put that bullshit argument about seeing to infinity away. I'm not sure why you feel the need to bring up such bullshit only to dismiss it, but hopefully not because I posted this:
OlivierK wrote:You can see curvature standing on a beach and looking at the horizon.

You'll note that I didn't say anything about seeing to infinity, or even to the other side of the sea, I simply noted that you can see the curvature of the earth; the horizon is visibly curved. Here, have a random tourism pic of a beach:

Image

Fisheye lens, barrel distortion and plain ole astigmatism will do that.
Visual daytime observations show that the minimum altitude at which curvature of the horizon can be detected is at or slightly below 35,000 ft, providing that the field of view is wide (60°) and nearly cloudfree.

Continues here.