Things do get hard to manage for some nations, especially those that straddle or are close to the International Date Line (which is in the middle of its time zone). There are no laws or rules telling other nations how to define their relationships to the time zones or to the date line. Even if there were, they would not be enforcible.
The island nation of Kiribati, for example, took some extraordinary liberties in 1997 by declaring that the date line moves to the east, as far over as about 150 degrees W. The effect of this was to make Caroline Island, nearly 30 degrees east of the standard location of the date line, the first place to experience sunrise in the new millennium. Coincidence, do you think? Their 'moving' of the date line did not change times in the time zones; only the date line moved.
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According to the standard definitions of the time zones, there are 15 degrees of longitude in each one. Fifteen times 24 equals 360 degrees for a full circle.
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Time zones are typically 15 degrees wide, corresponding to the 24 hours in a day and the 360 degrees in a full circle of longitude. Each time zone represents roughly one hour of time difference from the neighboring time zone.
If time zones were equally spaced (as nautical time zones are), then each time zone is 15o in width. However political time zones are not equally spaced, and to make things more complicated, there are half-step time zones, such as Newfoundland Calcutta. and Adelaide.
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Some political time zones are very wide. Greenland and China, for example, each have one time zone for the entire region, even though each region spans across more than three whole nautical time zones.
Each time zone covers 15 degrees of longitude (360 degrees divided by 24 time zones).
The Earth is divided into 24 time zones, each approximately 15 degrees of longitude wide. This system creates the basis for standard time zones around the world.
Each time zone would be approximately 18 degrees wide, since the Earth has 360 degrees of longitude and is divided into 20 time zones.
There are a total of 24 time zones based on the 360 degrees of longitude around the Earth. Each time zone is approximately 15 degrees in width, with the prime meridian at 0 degrees serving as the reference point for Greenwich Mean Time (GMT).
There are 24 time zones in the world, each 15 degrees of longitude apart. This allows for standardized timekeeping across the globe.