I get how time zones were established, and I get how people knew the earth was round thousands of years ago, so I assume that it was hypothesized that some areas of earth were darker/lighter than others at the same time. I feel like it was kind of unprovable though due to limitation. At what point did we actually confirm that it was indeed night time somewhere else when it was daytime on the opposite side of the world? And how was the found out?
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I forgot how to look it up, but it was when ancient scientists compared records on eclipses from different regions of the world and found that their timing differed – for example, one record said the eclipse began when the Moon was high in the sky, and another that the same eclipse started just after moonrise.
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