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View Resource National Institute of Standards and Technology: Time and Frequency Division

"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." At this website, visitors can find online exhibits about ethnic and historical calendars, the history of...

https://www.nist.gov/pml/time-and-frequency-division