You can do this yourself anytime you see a landmark/landmass really far away.

Just pull up Google Maps to find its distance from you, plug it into the universally-agreed-upon calculator of Earth's official curvature, and see how much droppage there's supposed to be at that distance.

In no time, you too will be called a crazy person on the internet for using your own eyeballs and basic math! https://video.nostr.build/5e871a36fe3441889fa406769147990f966884798b023afff790bebec434ab99.mp4