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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Unfortunately, we don’t know. Much like ancient people figuring out the shape of the earth, with these ideas just suddenly showing up in writing as already established, if not fully understood, ideas.
Its likely these sorts of ideas originated earlier than written language, meaning we will never know the ultimate source of the idea.
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