 Greenwich, England has been the home of Greenwich Mean Time (GMT) since 1884. GMT is sometimes called Greenwich Meridian Timebecause it is measured from the Greenwich Meridian Line at the Royal Observatory in Greenwich. It is the place from which all time zones around the world are related to.
GMT is World Time and the basis of every world time zone which sets the time of day and is at the centre of the time zone map. GMT sets current time or official time around the globe. GMT is Greenwich Mean (or Meridian ) Time is the mean (average) time that the earth takes to rotate from noon-to-noon. Most time changes are measured by GMT. Although GMT has been replaced by atomic time (UTC) it is still widely regarded as the correct time for every international time zone.
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