- About.com: The Invention of Clocks
 - About sun clocks, water clocks, and obelisks.  At the Third Stroke...
- History of the British speaking clock, now known as the Timeline, or TIM.- Cesium Atomic Clocks
- Provides background on the cesium-beam atomic clock.
- Clocks
- About the earliest to modern timekeeping devices.
- 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.
- HowStuffWorks: How Atomic Clocks Work
- Learn all about atomic clocks and how they keep the world ticking.
- humanclock.com
- Photos of humans are used to display the time accurately to within a minute.
- Journey in Time
- Illustrating the origins of concept and measurement of time.
- Last
- Process that combines a traditional analogue clock with a camera feed, creating a clock face that shows the history of the space it is looking at.
- Newton's Apple: Clocks
- About the origin of clocks and offers educational activities to demonstrate the concepts.
- Swisstime
- Company and product information on the Swiss watch industry including the latest technical and trend innovations, promotional events, archival data, and timely news releases.
- Time References for Setting Watches and Clocks
- Offers information on how to set your watch or clock accurately.
- Timekeeping History
- The history of timekeeping using the sun, stars, water, mechanical clocks, quartz, and atomic clocks. With related links.
- Wrist Dreams
- News source showcasing the latest technology in wristwatches.
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