This is due to atmospheric refraction
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
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