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Standard Time |
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standard time, civil time civil time, local time based on universal time. Civil time may be formally defined as mean solar time plus 12 hr; the civil day begins at midnight, while the mean solar day begins at noon.
..... Click the link for more information. used within a given time zone. The earth is divided into 24 time zones, each of which is about 15° of longitude wide and corresponds to one hour of time. Within a zone all civil clocks are set to the same local solar time solar time, time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial. ..... Click the link for more information. . Adjacent zones typically differ by a whole hour, although there are instances, such as in Newfoundland and South Australia, of half-hour zones. Standard time is based on universal time universal time (UT), the international time standard common to every place in the world, it nominally reflects the mean solar time along the earth's prime meridian (renumbered to equate to civil time). ..... Click the link for more information. . Standard time was largely the creation of the Canadian railway engineer Sir Sandford Fleming (1827–1915). Its establishment in the United States was mainly due to the efforts of the educator Charles Dowd and William Allen, secretary of the American Railroad Association. Standard time officially came into existence after a 19-nation White House meeting in 1884, with the prime meridian established at Greenwich, England. In the United States, time zones are regulated by the Dept. of Transportation. See also daylight saving time daylight saving time (DST), time observed when clocks and other timepieces are set ahead so that the sun will rise and set later in the day as measured by civil time. BibliographySee C. Blaise, Time Lord: Sir Sandford Fleming and the Creation of Standard Time (2001). standard timeOfficial local time of a region or country. Local mean solar time depends on longitude; it advances by four minutes per degree eastward. The Earth can thus be divided into 24 standard time zones, each approximately 15° in longitude. The actual boundaries of each time zone are determined by local authorities and in many places deviate considerably from 15°. The times in different zones usually differ by an integral number of hours; minutes and seconds are the same. See also Greenwich Mean Time. standard time the official local time of a region or country determined by the distance from Greenwich of a line of longitude passing through the area standard time [′stan·dərd ′tīm] (astronomy) The mean solar time, based on the transit of the sun over a specified meridian, called the time meridian, and adopted for use over an area that is called a time zone. (industrial engineering) A unit time value for completion of a work task as determined by the proper application of the appropriate work-measurement techniques. Also known as direct labor standard; output standard; production standard; time standard. Standard Time a universal time derived from astronomical observations of the time services of the USSR and the socialist countries participating in the work of the State Time Service of the USSR to obtain the most uniform possible time scale corresponding to the mean rotational velocity of the earth. Standard time was calculated in the period 1953–75 and published in the bulletins of the Interdepartmental Commission of the Unified Time Service Etalonnoe vremia v srednie momenty peredach radiosignalov (Standard Time at Mean Radiosignal Transmission Times). With the introduction of the uniform atomic time scale, the universal time scale lost its significance as a standard. Since 1975, universal time in the USSR is derived by a statistical probability method and yields information on changes in the rotational velocity of the earth and in the orientation of the earth’s axis in space for periods longer than a week. The findings are published in the bulletin Vsemirnoe vremia (Universal Time) of the Interdepartmental Commission of the Unified Time Service of the Gosstandart (State Committee on Standards) of the USSR. D. IU. BELOTSERKOVSKII Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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