Hi! Not discouraging more contributions here, but fyi, timezones have been a fairly popular subject around here - check out some previous posts

• When did people understood the concept of time zones (that when it's morning in america it's night in Europe)? - /u/jschooltiger kicks things off with Eratosthenes of Cyrene and Hipparchus of Nicaea.

• Additional follow-up comments in When first coming to the New World did people have solid grasp of timezones? Or did the long sea voyage distort their sense of time enough that they didn't notice?, also featuring /u/restricteddata, and more in When did the average person first become aware that it could be a different time of day in different parts of the world?

• Did the early Europeans (flat-world era) have any inkling of times zones. If so how did they explain these things... - /u/Crevecoeur cites Dante's Divine Comedy from 1321

• What's the first documented instance of travelers adjusting their routine/clocks to fit the local time? - /u/eighthgear talks about Greenwich Mean Time, est 1675

• At what point in time was humanity aware that there were different time zones in the world? - /u/mormengil provides an broad overview