The time zone

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Time zones are each one of the spherical sectors into which the Earth is divided. They divide the º of the Earth’s sphere between hours that complete a full turn around the Earth’s .

Each time zone measures º (360º / 24 hours = 15º). 15º = hour.

To calculate the time zone somewhere in the world, the meridian is used as a reference point.
From that point, one one hour for each time zone that is traveled through towards the East and one subtracts an hour each time zone that is traveled across towards the .