Why do we have different time zones?
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Since different parts of Earth enter and exit daylight at different times, we need different time zones. ... In order to build the time zone map, they studied Earth's movements. As Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full circle rotation of 360 degrees.
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Since different parts of Earth enter and exit daylight at different times, we need different time zones. ... In order to build the time zone map, they studied Earth's movements. As Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full circle rotation of 360 degrees.
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