What is the function of time zones and how are they marked?
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The idea behind multiple time zones is to divide the world into 24 15-degree slices and set the clocks accordingly in each zone. All of the people in a given zone set their clocks the same way, and each zoneis one hour different from the next.
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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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