Time and Frequency Division at the National Institute of Standards and Technology

The Time and Frequency Division is an operating unit of the Physics Laboratory of the (US) National Institute of Standards and Technology (NIST). It maintains the primary frequency standard for the United States, develops and operates standards of time and frequency and co-ordinates US time and frequency standards with other world standards. The Division's website provides details of its services and research, frequently asked questions, a glossary, a database of full text, time and frequency publications written by NIST personnel since 1914, and links to related websites. Web exhibits include: a history of the measurement of time, a history of calendars, the invention of the quartz watch, the background to daylight saving time, and a short history of NIST time and frequency measurement.

http://tf.nist.gov/

Copyright 2006-2009