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
1. Tell your friend to measure the shadow on a stick of a particular length when the sun is at the highest point of the sky on a particular date a few weeks away (or probably a few dates just to be sure in case it’s cloudy on one or two of those days)
2. Travel down to the other place where you want to measure the shadow. There, you do the same thing: using a stick of the same length as your friend’s, measure the shadow when the sun is at the highest point in the sky (again, over a few days to ensure you get some data that can be compared).
3. Come back home and compare notes.
You can figure out what point of the day the sun is highest in the sky by tracking the shadow throughout the day. Whenever the end of the shadow is closest to the stick, that’s when the sun is highest in the sky.
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