Wouldn't be so easy to just look at the horizon from left or right and save the hassle? Earth should curve from the sides also doesn't it?
Generally flatearther gurus ask for left to right curvature because they know it's a globe and they know you can't fit the curvature in frame. But it is possible to pan across the curvature and capture it if a structure behind the horizon is projecting a great circle. You know, something like a line of transmission lines. Like this ->
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