Did ancients know about timezonesHumans have been sailing from ages. And we have always had a mechanism to measure time. And the remains of ships from ancient times have a sundial type machine. But time isn't always measured using mechanics. Bushmen of Africa have been using their fingers to know time in hours for thousands of years. So we can all agree that we humans navigated a lot and saw time a lot. So can we agree that humans must have come across this weird phenomena called timezones?
Now this question sounds stupid because ships took months to reach another country and timezones were too spread out for people from smaller countries to notice. But what about Arabs? They travelled the extreme east in search of goods and spices. Didn't they notice that they are sometimes a few hours earlier that they must have been?
Were their time systems efficient enough to show this lapse of time because of timezones?