NIST maintains two major time scales. The core scale, AT1, is a weighted average of atomic clocks. The most-used output is the second time scale, UTC(NIST). UTC (NIST) is a real-time realization of the international standard, Coordinated Universal Time (U

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NIST maintains two major time scales. The core scale, AT1, is a weighted average of atomic clocks. The most-used output is the second time scale, UTC(NIST). UTC (NIST) is a real-time realization of the international standard, Coordinated Universal Time (UTC). UTC, is agreed by international treaty to be generated as a weighted average of clocks around the world.
NIST maintains two major time scales. The core scale, AT1, is a weighted average of atomic clocks. The most-used output is the second time scale, UTC(NIST). UTC (NIST) is a real-time realization of the international standard, Coordinated Universal Time (U

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National Institute of Standards and Technology
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