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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Probably when they stood on mountaintops and watched the sunrise draw its way across the land. Probably the question you don’t even realize you’re asking is when people started to understand the concept of “time” in the way you’re thinking of it – but it would have been a long, long time ago that people first knew something like “sunrise way up here on top of this hill is before sunrise for those people down in that deep valley”
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