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Photos of humans are used to display the time accurately to within a minute.
Cesium Atomic Clocks
Provides background on the cesium-beam atomic clock.
Company and product information on the Swiss watch industry including the latest technical and trend innovations, promotional events, archival data, and timely news releases.
News source showcasing the latest technology in wristwatches.
HowStuffWorks: How Atomic Clocks Work
Learn all about atomic clocks and how they keep the world ticking.
Clocks and Time
Lists publications, museums, newsgroups, and other resources.
Clockworks: From Sundials to the Atomic Second
Britannica.com offers a historical survey of timekeeping.
About the earliest to modern timekeeping devices.
About.com: The Invention of Clocks
About sun clocks, water clocks, and obelisks.
Newton's Apple: Clocks
About the origin of clocks and offers educational activities to demonstrate the concepts.
Journey in Time
Illustrating the origins of concept and measurement of time.
Time References for Setting Watches and Clocks
Offers information on how to set your watch or clock accurately.
The history of timekeeping using the sun, stars, water, mechanical clocks, quartz, and atomic clocks. With related links.