Time Zones. GMT watches and dual-time-zone watches.
There is a category of watches equipped with special feature: a second- time- zone indicator. These watches show both local time and the time in another time zone. They come in many varieties and have many names. Some are called GMT watches. GMT stands for Greenwich Mean Time, the time at the Prime Meridian in Greenwich, England, and the standard time for navigation and international radio broadcasts. GMT watches have an additional hour hand, set separately from the regular hour hand, which gives the hour in a second time zone using a 24- hour scale on the watch dial. Despite the watcha€™s name, which is a holdover from the days when pilots used Greenwich Mean Time for navigation, the second time zone can be any time zone in the world- it need not be Greenwich Mean Time.
Other called dual - time - zone watches shows the second time zone via a digital display or an analog subdial. Still others have two separate dials, either adjacent to each other or, in rare instances, back to back. In the latter type, the wearer must turn the watch over to see the second time zone.
World time watches give the time in all of the worlda€™s time zones simultaneously. Their bezels or dials bear the names of 24 cities throughout the world, one representing each time zone. These city - rings can be rotated against a 24- hour ring to show the time anywhere in the world.
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