Timekeeping
A Walk Through Time
A descriptive look at the history of timekeeping from ancient
to modern methods, with a brief introduction to NIST Time and
Frequency Services.
From
Sundials to Atomic Clocks: Understanding Time and Frequency (26.3 MB PDF)
Originally published in 1977, this full-length book provides a comprehensive,
easy-to-understand introduction to the field of time and frequency. Readers of
nearly all ages and educational backgrounds should find it enjoyable.
306 pages.
NIST Web Clock
Compare your computer's clock with NIST's atomic clock set to
Coordinated Universal Time (UTC).
FAQ
(frequently asked questions) and Glossary of
Frequency and Timing.
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Physics Laboratory Exhibits
in the NIST Virtual Museum
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