system
Given the following post, respond as if you're commenting on Reddit:
human
Is it actually possible to see the curvature of the earth while standing on its surface?

I hear many people say at various times that some area is so flat they can see the earth's curvature. Isn't the earth too big for that? Wouldn't any "curvature" observed just be a localized landscape that doesn't actually represent the earths profile?
gpt
It's most apparent in the ocean when there's no terrain to block your view. You can see the top of distant ships before you can see the bottom. It's the same with distant mountains. People have known the Earth was round for a long time.