Are there any Round Earther's on this forum that really do believe you can see the earth's curvature whilst standing at sea level on a beach?
Isn't possible to see the earth's curvature from sea level, you have to go very, very high. From ISS (400 km) it's possible, but the more convincing fact is not a single, still image from ISS, but observing the globe of the earth rolling by. Go on youtube and insert
earth from iss or something, you will find plenty of such videos that clearly show a globe. Needless to say, they are all faked by the
conspiracy.
It is perhaps necessary to add that there are now hundreds of men and women who have been on iss and recounted their experience, but of course they were all threatened with death and are lying.
Anyway, even from sea level we can
indirectly see earth's curvature, because we see a crisp line separating sky and ground. This is possible only on a globe. If the earth was flat, sky and ground should be separated by a fuzzy, blurry strip.