NOTE: I’m not a flat-earther, but have curiosity.
Seeing that famous clip of Carl Sagan explaining the Erathostenes experiment with the shadows of the pillars in Sion and Alexandria a question comes to me, how he knows the position of the shadow in the other site at the same hour? I mean, there were reliable clocks or time measuring methods at that time in order to be sure once traveled from one place to another that he was at the same hour of the day measuring the shadows?
Thanks in advance!!
In: 2
He measured the shadows at noon, the time when the sun is highest in the sky. That can be measured reliably enough with a simple sun dial. A couple of minutes earlier or later won’t make a hige difference in the calculation, frankly the uncertainty of measuring the distance would’ve caused much greater errors
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