> coordinating geographically dispersed events would become nearly impossible > I shouldn't need to adjust my wristwatch every few miles > many clocks do not

> coordinating geographically dispersed events would become nearly impossible > I shouldn't need to adjust my wristwatch every few miles > many clocks do not have line-of-sight to GPS satellites > you can't put a GPS chip in a mechanical clock > clocks on planes would literally run backwards There is a reason most timezone offset by hours. It is very convinient for everyone to agree on the time when ignoring the most significant digits. Otherwise, you end up having meetings start at 17 past the hour, and be much harder to mentally calculate the offset. You would also need to know the location of the other party much more presicily. At the moment, I know how to offset my schedule when planning a meeting with a customer in Texas.