standard time

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Related to Central Time: Time zones

standard time,

civil timecivil 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.
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 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 timesolar 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.
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. 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 timeuniversal 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).
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. 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 timedaylight 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. The amount of daylight on a given day of the year at a given latitude is fixed, but over the year the hours of
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.

Bibliography

See C. Blaise, Time Lord: Sir Sandford Fleming and the Creation of Standard Time (2001).

standard time

The time in any of the 24 internationally agreed time zones into which the Earth's surface is divided; the primary division is centered on the Greenwich (0° longitude) meridian. All locations within a single zone keep the same time. Zone times differ by a whole number of hours, or in some cases of half hours, from Greenwich mean time. Zones west of the Greenwich zone are behind GMT, those east of it are in front of GMT.

Standard Time

(religion, spiritualism, and occult)

Before the advent of rapid travel and modern means of long-distance communication, particular localities kept time according to the noontime position of the Sun. Because this varied east or west of any given location, the local time also varied as one traveled east or west. The imposition of today’s standard time zones, in which one must set her or his watch forward or backward as an imaginary line is crossed, is a comparatively recent innovation. To properly cast a horoscope, astrologers must find the “true” local time at which a native was born. In other words, a birth time expressed in standard time must be converted back into local “Sun time.” The more common designation for Sun time is local mean time.

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

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

standard timeclick for a larger image
Zone time.
An arbitrary time usually determined by the local mean time of the central meridian of the time zone. Unlike zone time, the boundaries are not confined to specific meridians. By international agreement, standard times normally differ by the whole number of hours; countries such as India whose standard time varies by 5½ h from GMT (Greenwich Mean Time) are exceptions. The air almanac contains three lists of time differences between GMT and standard times kept in countries throughout the world. List I has places that are fast on GMT (i.e., east of Greenwich); List II shows places that normally keep GMT; and List III indicates places slow on GMT (i.e., west of Greenwich).

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
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