> you can see curvature effects on a calm sea at a distance of only a few miles
Open sea is rarely calm. But lakes are sometimes calm. I've sometimes thought it would be fun to set up some kind of permanent markers, something like giant clapper boards along a straight line at the same height above the water, so that people walking around a lake could easily observe the curvature of the Earth. Has this been done anywhere?
I don't understand how that image (And this simulation[1]) is caused by curvature.
23 miles is ~0.001 of the Earth's circumference. How can that cause a visible difference in tower height? Even more so, the visible difference is in the last few miles, even smaller fraction.
>23 miles is ~0.001 of the Earth's circumference. How can that cause a visible difference in tower height?
It seems fairly intuitive that a tiny amount of an insane amount can still be a lot no?
I don't want to get too deep in the math right now since it's morning where i live nor am I good at it....
but if we'd just assume the earth was a nice sphere and a quick google was correct about a 12742 diameter then every degree down from the northpole to the equater would be on average a 70.79km difference in "height". Take a thousand of that and you're still dealing with an easily perceptible >7 meter difference.
Now all of this is shoddy quick thinking since the earth is not a nice sphere, this heigh difference is better not measured perpendicular to the equator but to the ground or center of the earth, etc but you get the idea i hope.
Dan Olsen published a video [0], last year, outlining his experiment on Minnewanka Curve and the ideology driving people who deny his, and similar results, demonstrating the curvature of the earth. While there is no artificial structure, he observes that trees on the opposite side of the lake are obscured by the water surface. He also published raw footage of the multiple recordings he took as a separate 28 minute video.
Open sea is rarely calm. But lakes are sometimes calm. I've sometimes thought it would be fun to set up some kind of permanent markers, something like giant clapper boards along a straight line at the same height above the water, so that people walking around a lake could easily observe the curvature of the Earth. Has this been done anywhere?