Standard time
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Standard time is the result of synchronising clocks in different geographical locations within a time zone to the same time rather than using the local meridian as in local mean time or solar time. The time so set has come to be defined in terms of offsets from universal time. (See more about standard time.)
Where daylight saving time is used, standard time may refer to the time without daylight saving time.
Prior to the 1883, solar time based on the "high noon" system, was used throughout the United States resulting in an inordinate number of local times. This caused convoluted regional and national train schedules. The heads of the major railroads met in Chicago to adopt the Standard Time System. The new system was adopted by most states almost immediately after railroads did so and finally officially adopted by the U.S. government almost fifty years later.
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