For example, the countries of Turkmenistan, Iran, and Oman are geographically positioned in a vertical north-south row, but they adhere to three different time zones (including Iran's custom GMT+03.50). Countries whose territory touches more than one time zone are free to choose which of those time zones they wish to utilize. While the borders between time zones are clearly defined, they are also notably flexible. Time zones are named according to their distance from the longitudinal meridian that passes through Greenwich, England and establishes the GMT+0:00 time zone. GMT divides the world into 26 time zones-one for each hour in the day plus two overlapping extras to accommodate the remote Pacific Island country Kiribati-each running vertically from Earth's north pole to its south pole. Originally developed by British railroads in the 1840s and made a global standard at Washington DC's International Meridian Conference in 1884, Greenwich Mean Time established a universal international standard time system that enabled the coordination of time all around the world. The Importance of Greenwich Mean Time (GMT)
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