This abbreviation comes as a result of the International Telecommunication Union and the International Astronomical Union wanting to use the same abbreviation in all languages. The official abbreviation for Coordinated Universal Time is UTC. See the " Current number of leap seconds" section for the number of leap seconds inserted to date. Leap seconds are inserted as necessary to keep UTC within 0.9 seconds of the UT1 variant of universal time. The current version of UTC is defined by International Telecommunication Union Recommendation (ITU-R TF.460-6), Standard-frequency and time-signal emissions, and is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the accumulated difference between TAI and time measured by Earth's rotation. The General Conference on Weights and Measures adopted a resolution to alter UTC with a new system that would eliminate leap seconds by 2035. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT) and (c) standard signals should contain information on the difference between UTC and UT." This change also adopted leap seconds to simplify future adjustments. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. UTC was first officially adopted as CCIR Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967.
The coordination of time and frequency transmissions around the world began on 1 January 1960. It is effectively a successor to Greenwich Mean Time (GMT). It is within about one second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) and is not adjusted for daylight saving time. We will call or email you with a shipping rate and to get your choice of location names.Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time.
Order below for a basic model with 2.5 inch digital time displays (readable from 75 ft) and fixed one inch high white location label characters. Size example: A six zone clock with 2.5 inch high numerals in one horizontal row (readable from 75 ft.) is 72.25 inches wide X 8.25 high X 3.25 deep. Three accuracy options: Ethernet USB, atomic time signal OR high accuracy crystal oscillator pre-calibrated, factory synchronized, no external synchronization required.ġ00-240 volts AC, 50-60 cycle, internal transformer, several styles of cords and plugs available. Three different size numerals to choose from: 1.8 Inch characters readable from up to 40 ft / 2.5 Inch characters readable from 75 ft / 4.0 Inch characters readable from up to 130 ft. Option for any unit to display up to 24 time zones and location names by page flipping. User changeable colors for time and digital location displays: Red, blue, green, yellow, magenta, cyan and white.ĭot matrix OR bar segment displays with option for alternating between time (12 or 24 hour format - switchable) and date. Optional scrolling message display under the time zone labels. Location name options: Fixed white vinyl lettering OR digitally changeable characters and color. Available in horizontal or vertical display layout in multiple rows or columns. See drop box for pricing on a basic model (pictured at the top) - call or email with questions or for a quote on a unit with specific option.īlack Anodized Aluminum Frame with anti-glare plexiglass lens. Model BRG Custom Digital Time Zone Clocks - LIFETIME ACCURACY - COLOR CHANGEABLE "World clocks with time zone displays, time clocks, atomic clocks, barometers and corporate gifts." Time Zone Clocks - Multiple Time Zone Digital Clocks
0 kommentar(er)
