this post was submitted on 18 Dec 2023
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To me, it's: That ancient people thought the Earth was flat.

We have records from around 430BC where Greek philosophers spoke of the Earth being a sphere. In 240BC the Greek astronomer Eratosthenes calculated the circumference of the Earth and was only about 2% out.

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[โ€“] barf@kbin.social 4 points 10 months ago (1 children)

Where does the distance to the sun enter into this equation?

[โ€“] flatearth@kbin.social 1 points 10 months ago

Did he make an assumption about the distance of the sun?
Did he assume parallel rays?