Ok. You do understand that ''at sea level'' is the very location that is being contested, right?
An observing fly-on-the-wall would be the final authority on whether or not the elevation was measured from flat or bulbous ground.
If 2 individuals over a vast distance take a measurement and see they are both 20 meters above sea level elevation that does nothing to determine where they are in relation to eachother.
Nah, you are complicating a very simple test to avoid doing it yourself.
I found my own altitude, and the landmark I used is less than 4 metres above sea level, by all accounts and my own eyes. It’s a small, low island which should be completely hidden by the ocean, IF the earth were curved. But it’s not, because it’s not.
Lol. If you are wondering why results could show you are above sea level, with that instrument while you are - literally - standing - above - sea - level, then I don't know what to tell you
Ahhh, no? That’s not what I’m wondering at all! The fly on the wall thing confused me!
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