While the stability of TAI is achieved by this weighted average, the accuracy of TAI is derived from data from primary frequency standards, which are clocks built at several national metrology institutes. Thus, if N = 300, the maximum weight is 0.83 %. The most stable clocks receive the most weight in the calculation, but the maximum weight assigned to any clock is limited to A / N, where A = 2.5 and N is the number of clocks. These clocks are located at more than 60 timing laboratories around the world. International Atomic Time (TAI) is an international time scale that is computed by taking the weighted average of more than 300 atomic clocks. What are International Atomic Time (TAI) and Coordinated Universal Time (UTC)? It is distributed through the NIST time and frequency services and continuously compared to the time and frequency standards located around the world. UTC(NIST) serves as a national standard for frequency, time interval, and time-of-day. The clocks in the UTC(NIST) time scale also contribute to the International Atomic Time (TAI) and Coordinated Universal Time (UTC). The most stable clocks are assigned the most weight. The outputs of the clocks are combined into a single signal by using a weighted average. The number of clocks in the time scale varies, but is typically around ten. The UTC(NIST) time scale comprises an ensemble of cesium beam and hydrogen maser atomic clocks, which are regularly calibrated by the NIST primary frequency standard. UTC(NIST) is the coordinated universal time scale maintained at NIST. Why is UTC used as the acronym for Coordinated Universal Time instead of CUT?.What are International Atomic Time (TAI) and Coordinated Universal Time (UTC)?.How is UTC(NIST) related to Coordinated Universal Time (UTC) International Atomic Time (TAI), Greenwich Mean Time (GMT), USNO time, GPS time and Zulu time? Two-Way Satellite Time and Frequency Transfer (TWSTFT).When this page loaded, it was Tuesday, 2022 September 20, 19:46 in UTC. If the time is 07:00 UTC, the local time is 02:00 in New York (UTC−5) and 10:00 in Moscow (UTC+3).Ġ7:00 UTC is also written more simply as 0700Z (or 07:00Z).
For example, UTC−5 ( United States east coast) is 5 hours behind UTC. Time zones are often named by how many hours they are different from UTC time. It offers one time for all the Internet (the same time can be used by people all over the world).
Some websites, for example Wikipedia, use UTC because it does not make any country look more important than the others. In fact, there is no practical difference which would be noticed by ordinary people. The standard before was Greenwich Mean Time (GMT). It is, within about 1 second, mean solar time at 0° longitude. It is the standard by which the world regulates clocks and time. Light colours indicate countries that do not observe summer time.Ĭoordinated Universal Time (or UTC) is the standard time system of the world.
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