The full form of GMT is Greenwich Mean Time. The Mean Solar Time at Greenwich London’s Royal Observatory is GMT. It is measured at the Earth’s meridian, which is a zero-degree longitude line. These lines run from the North Pole to the South Pole, passing through Greenwich, London’s Old Royal Observatory.
A Brief History of GMT
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- GMT was not formally adopted by the British Parliament until August 2, 1880.
- The United States ratified it on November 18, 1883.
- GMT was adopted globally at the 1884 International Meridian Conference, and 24 time zones were established.
- Today, GMT is utilised as the civil time or UTC for the United Kingdom.
Points to remember about GMT:
- GMT is regarded as a global time standard. It was established in 1884 and is used as a standard for all time zones as well as a global chronological reference.
- Greenwich Mean Time is also known as Greenwich Meridian Time since it is calculated from the Greenwich Meridian Line.
- It is centred on the earth’s rotation, which is erratic, but it observes a fake mean and accounts for uniform velocity across the equator.
- GMT is world time, and it is the foundation of world time. It is a true time reference and so does not change with the weather.