system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't time zone borders straight and equidistant from each other like longitude/latitude lines?
gpt
Time zone borders are roughly drawn 15 degrees apart, but move do to the convenience of commerce.

It would be really bad, for example, for a time zone boundary to cross in the middle of a city. It would help nothing, and cause a lot of problems.

So, whereever possible, the time zone boundaries are in rural areas where the economic impact of the time change is minimal.