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standard time The United States and its possessions are, by law, divided into eight time zones. The limits of each time zone are defined by the Secretary of Transportation in Part 71, Title 49 of the Code of Federal Regulations. The standard time within each zone is the local mean time at the standard meridian that passes approximately through the center of the zone. Since the standard meridians are the same as those used with Zone Time, standard time conforms generally with the zone time for a given area. The standard time zone boundary may vary considerably from the zone time limits (7 1/2° in longitude on each side of the standard meridian) to conform to political or geographic boundaries or both. The standard times used in various countries and places are tabulated in the Air Almanac and the Nautical Almanac and are displayed on Chart 76, Standard Time Zone Chart of the World.

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