So in a story someone says, "I woke up at 5:00 every day" it would be meaningless without also knowing roughly what longitude they were at (With time zones it's

So in a story someone says, "I woke up at 5:00 every day" it would be meaningless without also knowing roughly what longitude they were at (With time zones it's approximate, but we know it means they woke up early). If we had a "universal time" - like all our clocks are on UTC - I think people would naturally invent local times and we'd be back to time zones.