Welcome to the NIST Time and Frequency Division, an operating unit of the Physical Measurement Laboratory of the National Institute of Standards and Technology (NIST), an agency of the U.S. Department of Commerce. We are located in Boulder, Colorado at the NIST Boulder Laboratories (shown at right).
Our mission includes:
Precise time and frequency information is needed by electric power companies, radio and television stations, telephone companies, air traffic control systems, participants in space exploration, computer networks, scientists monitoring data of all kinds, and navigators of ships and planes. These users need to compare their own timing equipment to a reliable, internationally recognized standard. NIST provides this standard for the United States.
See also legal notes about this site.
Please send us email if you have questions, comments, corrections, or suggestions regarding the NIST Time and Frequency division web site.
Ion Storage Group
Time and Frequency Metrology
Time and Frequency Services
Optical Frequency Measurements
Atomic Devices and Instrumentation
National Institute of Standards and Technology
Time and Frequency Division 847
Boulder, CO 80305-3328
(303) 497-6461 (fax)