this post was submitted on 15 Feb 2025
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The existence of the North Pole star and the Southern Cross is enough evidence that the earth is round. On a flat earth, you should see the same constellations no matter where in the earth you are.
The Southern Cross was so important for celestial navigation on the southern hemisphere it’s in multiple flags (Brazil, Australia and New Zeeland, for example).
Yeah, Eratosthenes already knew it was round.
What he did with the two sticks (and paying a guy to take a damn long walk) was measure it.
And he was only off by like single digit percentages.