You can just calculate the circumference of the Earth by looking at shadows! That's how they proved Earth was round without airplanes and spaceships and what not. Simple geometry.
https://www.aps.org/apsnews/2006/06/eratosthenes-measures-earth
You can just calculate the circumference of the Earth by looking at shadows! That's how they proved Earth was round without airplanes and spaceships and what not. Simple geometry.
https://www.aps.org/apsnews/2006/06/eratosthenes-measures-earth
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