Greenwich Mean Time
Greenwich Mean Time (GMT)
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, counted from midnight. Formerly, it was used as the world's time standard. The term Greenwich Mean Time is especially used by bodies connected with the United Kingdom, such as the BBC, the Royal Navy, the Met Office and others particularly in Arab countries, such as the Middle East Broadcasting Center and OSN. It is a term commonly used in the United Kingdom and countries of the Commonwealth, including Australia, South Africa, India, Pakistan, Bangladesh and Malaysia, and many other countries in the Eastern Hemisphere.
Pronunciation
Greenwich Mean Time is pronounced as /ˈɡrɛnɪtʃ ˈmiːn taɪm/
Etymology
The term "Greenwich Mean Time" comes from the Royal Observatory's location at Greenwich, London. The word "mean" in "Greenwich Mean Time" comes from the average or mean time that the sun crosses the Prime Meridian each day.
Related Terms
- Prime Meridian: The meridian (line of longitude) at which the longitude is defined to be 0°.
- Coordinated Universal Time (UTC): The time standard used in aviation, computing, navigation, weather forecasting, and many other fields. It is within about 1 second of mean solar time at 0° longitude, and is not adjusted for daylight saving time.
- Time Zone: 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.
External links
- Medical encyclopedia article on Greenwich Mean Time
- Wikipedia's article - Greenwich Mean Time
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