time zone

time zone: see standard time.

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time zone

a region throughout which the same standard time is used. There are 24 time zones in the world, demarcated approximately by meridians at 15° intervals, an hour apart

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time zone [′tīm ‚zōn]

(astronomy)

To avoid the inconvenience of the continuous change of mean solar time with longitude, the earth is divided into 24 time zones, each about 15° wide and centered on standard longitudes, 0°, 15°, 30°, and so on; within each zone the time kept is the mean solar time of the standard meridian.

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time zone - One of approximately 24 longitudinal divisions of the globe, nominally 15 degrees wide, in which clocks show the same time. Some zones follow the boundaries of states or territories, others differ from neighbouring zones by more or less than one hour. Computers can be programmed to take into account the time zone each user is working in, which is not necessarily the same as the zone the computer is in. See also TZ.