Time plays a very important role in our daily lives, helping us plan, travel, and communicate across the world. To keep time uniform everywhere, an international standard is followed. This standard allows people from different countries to coordinate activities easily. Before the invention of this system, every place had its own local time, which often caused confusion and difficulty in global communication.
The full form of GMT is Greenwich Mean Time. It is the average solar time measured at the Royal Observatory in Greenwich, London. In simple words, GMT is the time calculated based on the position of the sun at the Prime Meridian, which divides the Earth into the Eastern and Western Hemispheres. This line serves as the main starting point for measuring time around the world.
Before GMT was introduced, each city followed its own local time by watching the sun’s movement. This created confusion, especially when railways and international travel began. To solve this problem, scientists and world leaders gathered in 1884 at the International Meridian Conference in Washington, D.C. They decided that the Prime Meridian at Greenwich would be the reference line for time, and thus, Greenwich Mean Time was officially adopted.
GMT is the base for all time zones across the world. Every other time zone is measured by how many hours it is ahead of or behind GMT. For example, India follows GMT +5:30, which means it is 5 hours and 30 minutes ahead of Greenwich time.
GMT is important for many fields such as:
To sum up, GMT (Greenwich Mean Time) is the time standard that brought the whole world onto one clock. It made travel, trade, and communication much easier and continues to guide timekeeping even in the digital age. No matter where you are, GMT helps connect everyone under one universal system of time.
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