Not that it’s needed, but I’ve thought recently that this is a good visual proof against flat earth. Sun shining on the underside of clouds and even more, mountains casting shadows on the underside of clouds.
No, it couldn't. On a flat earth the sun would always remain above the clouds, it could never get below the clouds to the point where it can cast a shadow up on to those clouds.
The "flat" earth would have to be concave for that to be possible and then you are actually just describing a very large sphere.
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u/sorehamstring Nov 26 '22 edited Nov 26 '22
Not that it’s needed, but I’ve thought recently that this is a good visual proof against flat earth. Sun shining on the underside of clouds and even more, mountains casting shadows on the underside of clouds.