Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
https://video.nostr.build/cc3c7af4bf2dd5343b6a5be87f5f1cf96d8941e63cd86a5cf200bea0116c1f0b.mp4
How can it be conclusive? May be just curved between these two places.. ;-)
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