With time, Fleming’s proposition became widely accepted. He explained that since the earth rotates 15 degrees every hour (or 360 degrees in 24 hours), dividing the world into 24 time zones that were each 15 degrees of longitude apart made sense. He was mainly instrumental in having a unified world timing system by helping to convene the International Meridian Conference. It was Sir Sanford Fleming, in 1878, who first proposed the idea of using international time zones. The need for a better and unified timing-keeping system became not only noticeable but urgent. The reason for this was simple-many trains were scheduled to operate at specific times for both departure and arrival. Time calculation also became a severe problem for long-distance travelers. His discovery became the foundation upon which Act 5 George III (the Longitude Act) was built: the same longitudinal concept that we still use today.Īlthough the Longitude Act made it easier to locate ships at sea at the period, the heightened need for an efficient, time-saving system of telecommunication and the expansion of various means of transportation in the 19th century became a stumbling block. Then in 1764, an English horologist, named John Harrison, invented the clock that could be used to determine the location of a ship at sea. One of the drawbacks of the pendulum clock, however, was that it could not accurately measure time for scientific purposes and could not also sufficiently determine longitude at sea. The sun was used to measure time, with people telling the time using sundials.Īs time went by, and around the 17th century, some other tools such as pendulum clocks came onto the scene. An example of these large clocks was the Time Bell (Zytglogge Tower) in Switzerland. What usually was the ‘standard’ was, in many cases, a clock tower or large clock placed in strategic places in these locations where everyone could see it. In the United States alone, there were more than 300 local times during this period. Time varied across short distances, and there were no time standards. In military GMT is known as Zulu time.Greenwich Mean Time was the same as Universal Time (UT), until the introduction of UTC in 1972 a standard astronomical concept used in many technical fields.A few centuries ago, every country, city, and town of the world was actually on its own time. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use for the most parts it is the same. Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. Other major cities in the area are Abidjan, Dakar, Grand Dakar, Accra Principal Cities: The largest city in the GMT timezone is London from United Kingdom with population about 7.557 million people. Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in EuropeĬountries: It is used in following countries: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo Offset UTC -4:00 hoursĨ:00 pm 20:00 Greenwich Mean Time (GMT). Offset UTC -7:00 hoursĤ:00 pm 16:00 Eastern Daylight Time (EDT). Pacific Daylight Time is 3 hours behind Eastern Daylight Time and 7 hours behind Greenwich Mean Timeġ:00 pm 13:00 in PDT is 4:00 pm 16:00 in EDT and is 8:00 pm 20:00 in GMTīest time for a conference call or a meeting is between 8am-3pm in PST which corresponds to 11am-6pm in ESTīest time for a conference call or a meeting is between 8am-10am in PST which corresponds to 4pm-6pm in GMTġ:00 pm 13:00 Pacific Daylight Time (PDT).
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