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The Greenwich Meridian at 0 degrees longitude is used as a universal coordinator of all time zones, which means that all time zones refer to the Greenwich Meridian. For example, if a time zone states UTC +8, that means that it is 8 hours earlier than the time at the Greenwich Meridian.

On the other hand, the International Date Line located roughly at 180 degrees longitude, is a divider between Day 1 and Day 2.

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