Ahhh, no? That’s not what I’m wondering at all! The fly on the wall thing confused me!
Got it. https://www.phrases.org.uk/idioms/a-fly-on-the-wall.html
Basically from what I understand you are saying is that you took the elevation of an island then figured how far as the crow flies it would take before the published curvature of the earth would drop below sea level. But when you stood in that location and checked your altitude you were, indeed, not below sea level as should have been the expected results? Is that an accurate description?
Nope.
I found my elevation. I found distance between my location and the island. I input those figures into an earth curve calculator, which showed the island should be hidden by curvature.
And you are saying you can see the island with the naked eye which should be impossible
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