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The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
As a result, in 1870 he published a pamphlet entitled "A System of National Time for Railroads" wherein he proposed four time zones, each 15° wide, the time of each being one hour different from the next, named Washington, first, second, and third hours. The central meridian of the first zone was the Washington meridian.
Sir Sandford Fleming House (1866–1871), Brunswick St., Halifax, Nova Scotia In 1827, Fleming was born in Kirkcaldy, Fife, Scotland [2] to Andrew and Elizabeth Fleming. At the age of 14 he was apprenticed as a surveyor and in 1845, [3] at the age of 18, he immigrated with his older brother David to colonial Canada.
From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley. Central Time Zone (Zone S), which comprises roughly the Gulf Coast, Mississippi Valley, and most of the Great Plains.
In theory, ships are supposed to adopt the standard time of a country if they are within its territorial waters within 12 nautical miles (14 mi; 22 km) of land, then revert to international time zones (15° wide pole-to-pole gores) as soon as they leave. In practice, ships use these time zones only for radio communication and similar purposes.
Arthur C. Clarke proposed the use of a single time zone in 1976. [2] Attempts to abolish time zones date back half a century [1] and include the Swatch Internet Time. Economics professor Steve Hanke and astrophysics professor Dick Henry at Johns Hopkins University have been proponents of the concept and have integrated it in their Hanke–Henry Permanent Calendar.
This time zone was also known as the Loenen time or Gorinchem time, as this was the exact time in both Loenen and Gorinchem. At noon in Amsterdam, it was 11:40 in London and 12:40 in Berlin. The shift to the current Central European Time zone took place on 16 May 1940. The German occupiers ordered the clock to be moved an hour and forty minutes ...