![]() ![]() 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). ![]()
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