Comments by "Flook D" (@flookd5516) on "Jubilee"
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@joshuaseabrook9835 You can see the effect of curvature of objects passing over the horizon, e.g., the sun rising & setting every day and only mountain tops being visible from a significant distance. Smaller objects can pass beyond the limit of your visual acuity long before they reach the horizon which is why FE'ers talk about zooming a boat back into view but never try it with sun & mountains.
How far you can see depends on curvature, elevation (observer & object) and atmospheric refraction, not curvature alone. The equation you refer to is a rule of thumb for geometric drop, much beloved by FE'ers because it is simple, possess only one variable and gives the wrong answers. That it is a parabolic equation and is never going to describe a circle doesn't faze them nor the fact that it doesn't take into account elevation & refraction, hence the wrong answers. The actual calculations are not simple; see separate comment in case YT takes exception to website names.
I would note that the ancient Greeks deduced the Earth's shape from the motion of the sun, horizons, angle to Polaris matching latitude, constellations changing with latitude, two celestial poles and solar eclipses always having a circular shadow; all verifiable by anybody, all indicative of a sphere, all disproving the earth is flat and all unexplained by FE'ers.
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