Time Zone

Running head: World epoch Scale Time Z adept Theresa Hinton University of Phoenix January 21, 2012 Introduction some cities most the world historically kept their own clip by using some type of instrument to superintend the fair weathers high point at noon.  The soonest specify measuring devices used either the suns nates or the rate in which water runs egress of a vessel. The pendulum clock was developed during the 17th century these quantify were sufficiently accurate to be used at ocean to congeal longitude and for scientific fourth dimension measurement in the eighteenth century. (timeanddate,2010) accounting of Time Zone A criterion time geographical regulate generally refers to any of the 24 regions of the earths surface, shared by longitude, in which standard time is kept. Howeve r, the frame of standard time zones is questionable and discussed among various sources, particularly with date to the world(prenominal) Date Line. (NIST,2010) The Greenwich Meridian, divide the main separation of time zones.

apiece time zone is 15 degrees of longitude in width, with local differences, and views a clock time one hour earlier than the zone immediately to the east. (NIST,2010) Time zones can be determined by how countries and states borders are positioned. Individual zone boundaries are not straightforward because they are adjusted for the convenience and wishes of local population s. Furthermore, some geographically large co! untries, such(prenominal) as India and China, use only one time zone but other large countries, such as Russia and the United States, have more than one time zone.  The United States uses nine standard time zones. From east to tungsten they are Atlantic cadence Time (AST), Eastern regularize Time (EST), Central timeworn Time (CST), Mountain sample Time (MST), Pacific quantity Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and...If you study to get a full essay, order it on our website: OrderCustomPaper.com

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