Comments by "Scott Wallace" (@therealzilch) on "Johnny Harris"
channel.
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@jayuski Everyone here has answered your question, one way or another. I'll try to be more specific. First off, you can see that there must be curvature on any clear day, when you can see a horizon over water. On a flat Earth, there would be no clear horizon, just a gradual fading away in the distance. What would form a horizon on a flat Earth, lookin over an ocean?
Second: you can measure the curvature in a number of ways. One is to take a theodolite to the seashore, measure the drop of the horizon and the height of the theodolite above sea level, apply some simple trig, fine tune for refraction if you're fussy, and you have the mean curavture. There are calculators online which will do the math for you.
I hope that helps. Cheers from sunny Vienna, Scott
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