We can barely make out our own planet from the edge of our own solar system. Do you think we can see man-made structures from the center of our galaxies? Of course not. Does that mean they’re not visible from space?
A few months ago I released an experiment video explaining how Eratosthenes calculated the circumference of the Earth using the shadow of sticks. The method was performed almost two millenia ago, and produced quite accurate results (considering the ‘equipment’ used). But it was far from being the only (or first) method to understand our planet’s [...]
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