Weatern Austrailia is, for example, 9 hours ahead of the UK, but that difference wouldn't have made much material difference until instant communications became possible, a very long time afrer it's discovery. Explorers wouldn't notice gradual shifts in time at the speeds they travelled until the last century or so. My question isn't about how time zones got sert and agreed, but more when and how did people first notice that the days were out of synch in far flung places?
Pointing out the FAQ and previous answers is not to discourage further questions. Follow-on questions, information, and debate is welcome.
These are the two links in the FAQ section Clocks / Time zones and time differences:
"At what point did humans understand the existence of timezones - i.e. that the sun didn't rise and fall the same way everywhere?" at https://www.reddit.com/r/AskHistorians/comments/7ahhv3/at_what_point_did_humans_understand_the_existence/ , answers by /u/restricteddata and /u/jschooltiger
"When did people understood the concept of time zones (that when it's morning in america it's night in Europe)?" at https://www.reddit.com/r/AskHistorians/comments/3uufv2/when_did_people_understood_the_concept_of_time/cxhy3fd/ by jschooltiger
Other previous discussions:
"How long did it take Columbus to realize he wasn't in Asia?" at https://www.reddit.com/r/AskHistorians/comments/sfzx1/how_long_did_it_take_columbus_to_realize_he_wasnt/ , answer by /u/jabbercocky
"Did the early Europeans (flat-world era) have any inkling of times zones. If so how did they explain these things..." at https://www.reddit.com/r/AskHistorians/comments/wpro0/did_the_early_europeans_flatworld_era_have_any/ , reply by Crevecoeur
"Did people in ancient and medieval times know about time zones?" at https://www.reddit.com/r/AskHistorians/comments/4z5u3y/did_people_in_ancient_and_medieval_times_know/ , reply by qed1
Ah! Thanks!