Time zone
Time zone
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in close commercial or other communication to keep the same time.
Pronunciation
- IPA: /ˈtaɪm zoʊn/
Etymology
The term "time zone" comes from the practice of dividing the world into zones for which a uniform standard time is kept. The concept was first proposed by Sir Sandford Fleming in the late 19th century, and was adopted in 1884 at the International Meridian Conference.
Related Terms
- Standard time: The uniform time for each time zone that is set by law or by custom.
- Daylight saving time: A system of adjusting the official local time forward, usually by one hour, during the longer days of the year.
- Coordinated Universal Time (UTC): The primary time standard by which the world regulates clocks and time.
- Greenwich Mean Time (GMT): The mean solar time at the Royal Observatory in Greenwich, London, counted from midnight, used before the adoption of UTC.
- International Date Line: An imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
External links
- Medical encyclopedia article on Time zone
- Wikipedia's article - Time zone
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