time zone

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time zone:

see standard timestandard time,
civil time used within a given time zone. The earth is divided into 24 time zones, each of which is about 15° of longitude wide and corresponds to one hour of time. Within a zone all civil clocks are set to the same local solar time.
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time zone

See standard time.

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.

time zone

time zoneclick for a larger image
The time, kept in sea areas, in a 15° zone of longitude, with the central (standard) meridian of each zone 15° or multiples of 15° removed from the Greenwich Meridian. The time of successive zones differs by one hour. Each time zone is allotted a letter, increasing from A to Z but without letters I and O. Almost all countries follow the times as per zones, but a few countries use a differential that is a half hour instead of a full hour. For example, the time zone for India is Echo-Foxtrot (—5½), which means that Indian Standard Time is 5½ h behind Greenwich Mean Time. The time zone at Greenwich is Zulu. See also zone time.

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

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.
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