This leads us to the first similarities shared by the UTC and UTC(NIST) time scales, both are based on the SI definition of the second and both depend upon atomic clocks to keep time.Īnother similarity between UTC and UTC(NIST) is that both keep time not with just one atomic clock, but rather by using an “ensemble” of atomic clocks.
It’s defined as “The duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom”, and its duration is precisely determined by cesium atomic clocks. Since 1967, the SI second has been an “atomic” second. One of the base units is the second, which serves as the standard unit for time interval and the foundation for world timekeeping. The SI is built upon seven base units of measurement. Its mandate is to provide a single, coherent system of measurements based on an International System of Units (SI). Therefore, the BIPM maintains neutrality as an intergovernmental organization that is not controlled by any country. The UTC time scale is maintained and distributed by the Bureau International des Poids et Mesures (BIPM), or in English, the International Bureau of Weights and Measures, which is located near Paris, France in an area considered to be international territory. To better understand the UTC(NIST) time scale, it is helpful to look at its similarities and differences with respect to UTC.
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