| 24 hour analog clocks | | The 24 hour analog clock and watch site. History, software, and the places to find clocks with 24 h dials. |
| Allan Variance -- Overview by David W. Allan | | Core algorithm of international time scale has multiple metrology applications, from atomic clock frequency characterization to definition of the meter. Equation, explanation and publications. |
| Antique Horology | | The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers. |
| Clocks and Time | | Horological index for organizations, clock and watch museums, related software, mailing lists and links. Maintained by Gordon T. Uber. |
| Cumbria Clock Company | | Company specialized in all aspects of work connected with church clocks, public clocks, and tower clocks which includes the full historical restoration of antique clock movements. |
| Hampton Court Clock | | The story of the famous Astronomical clock at Hampton Court Palace. By the author of the original official guide books with the extra omitted information. |
| Horology - A Great Hobby | | A very basic introduction to how electric clocks work, with animated pictures. Also a collection of cheap electric clocks with pictures and descriptions. |
| Horology.com | | Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally. |
| How Stuff Works: Time | | Complete five-part explanation of time and how it is measured, including information about clocks, time zones, calendars, BC and AD. |
| Jens Olsen's Astronomical Clock | | Description of the restoration of Jens Olsen's Astronomical Clock, a masterpiece in Copenhagen City Hall that consists of 15.448 individual parts. |
| Louis Essen | | Autobiography of the physicist who built the world's first operational atomic clock. |
|
|
