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	The starting point where the time is set to zero is located at Greenwich England and is regarded as the standard time called Greenwich Mean Time (GMT). From this location or line of longitude, times at other locations or other time zones can be calculated. This is done by adding one hour for every time zone or 15 degrees difference to the East of GMT (at zero degrees longitude), or subtracting one hour for every time zone or 15 degrees difference to the West of GMT (at zero degrees longitude).
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