Uploaded March 2018 | Updated September 2026, 1 hour ago

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This might seem like a lot of "proofs", but it's not as long as you think.

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Original video:
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Sources and other related junk:

History of surveying:
metabunk.org/curvature-and-refraction-in-surveying-and-leveling-through-history-old-books-etc.t8856

Soundly's Channel:
youtube.com/channel/UCDXr2cbK7WlfeYEtJxC9i3w
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