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
If you travel and measure the angle at the same day in the year, the sun has that same inclination as when you measured the stick at the other location. Within a month the sun’s position doesn’t change much, and the error of your measurements is affected by other things much more
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