Question

How are time zones determined?​

Answer 1

Explanation:

Geographers have divided the entire globe into 24 time zone each spanning 15°. The middle longitude of each time zone is taken as the standard meridian and the time on that meridian is generally followed all over the time zone as the standard time.

Answer 2

Every 15 longitudinal degrees, the time changed by an hour, thus creating 24 time zones around the world.

Over the years, governments have adopted, altered or ignored Greenwich Mean Time (GMT) as they saw fit. The U.S. didn't sign its time zones into law until 1918

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