Time Z one
Theresa Hinton
University of Phoenix
January 21, 2012
Introduction
some cities around the world historically kept their own clip by using some type of instrument to superintend the suns high point at noon. The soonest quantify measuring devices used either the suns shadow 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 determine longitude and for scientific time measurement in the eighteenth century. (timeanddate,2010)
Explanation of Time Zone
A criterion time geographical zone generally refers to any of the 24 regions of the earths surface, shared by longitude, in which standard time is kept. However, the number of standard time zones is questionable and discussed among various sources, particularly with regard 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 substantial because they are adjusted for the convenience and wishes of local populations. Furthermore, some geographically large countries, such 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. Â The United States uses nine standard time zones. From east to tungsten they are Atlantic cadence Time (AST), Eastern standardized Time (EST), Central timeworn Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and...If you involve to get a full essay, order it on our website: Orderessay
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