Greenwich Mean Time, commonly known as GMT, is a time standard that originated from the Royal Observatory in Greenwich, London. GMT serves as the baseline for global timekeeping and is used to coordinate time zones worldwide. This guide explains GMT in simple terms, its importance, and its relevance in our daily lives.
Greenwich Mean Time is basically the yearly average and the mean of the time every day when the
Sun cross the Prime Meridian at the Royal Observatory Greenwich.
GMT abbreviated for Greenwich Mean Time that is the local clock time at Greenwich. Greenwich
Mean Time (GMT) is also the mean solar time at the Royal Observatory in Greenwich, London. Since
the year 1884 till 1972, GMT was the international standard of the civil time. Afterwards it was
replaced by Coordinated Universal Time (UTC); Greenwich Mean Time (GMT) is now also the legal
time in Britain in the winter that is used by the Met Office, Royal Navy as well as BBC World Service.
Greenwich Mean Time is also known as the time zone that is used by some countries in Africa and
Western Europe and including in Iceland all year round. It was the international standard for civil
time but now it is largely replaced by Coordinated Universal Time (UTC).
Greenwich Mean Time (GMT) is a time system that signifies the mean solar time at the Prime
Meridian that runs through the Royal Observatory in Greenwich, London. GMT served as the
international standard for civil timekeeping and also played an essential role in navigation as well
as global communication. GMT is calculated on this basis of the Earth's rotation and also its relation
to the Sun. It offers a standardized time suggestion that is not effected by time zones and daylight-
saving time adjustments.
* The ‘Greenwich Mean Time’ (GMT) is the time that basically measured with the help of
“Earth’s zero degree” line of longitude and meridian.
* This line that is known as the Greenwich Meridian basically runs from the ‘North Pole’ to
the ‘South Pole’ and crosses through the ‘Old Royal Observatory’ in the Greenwich, London.
* Keeping this line as the marker, the terrestrial longitudes are highly marked and measured
as well as the world’s various time zones are calculated.
* If a country lies the west to the meridian, then the time will be at the back and will lose from
the GMT.
* If a country lies the east to the meridian, then it will be ahead of Greenwich Mean Time and
will gain time.
Although “Greenwich Mean Time” (GMT) and “Coordinated Universal Time” (UTC) often emerge as interchangeable in casual use, and there are technical distinctions. GMT is basically based on the Earth's rotation and its position around the Sun, making it a type of solar time. UTC, though, is based on the International Atomic Time (TAI) with the leap seconds added to keep it within 0.9 seconds of Universal Time (UT1) that is a modern continuation of GMT and adjusted for the Earth's irregular rotation.