National Institute of Standards and Technology, The Time and Frequency Division, part of NIST's Physics Laboratory, maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.NIST sets the official time for the internet and U.S. telephone systems, and runs Radio Station WWVB in Colorado, the station your atomic clocks tune in to set their time accurately.
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