Gateway to all aspects of clocks, watches, timekeeping, and the science of horology.

National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.

The Smithsonian Institute's exhibition on the changing ways we have measured, used, and thought about time over the past three hundred years.

Organization of watch and clock enthusiasts.

Website showing the restoration of a French flat bed tower clock in great detail, step by step, as well as other information and links of tower clock sites.

Autobiography of the physicist who built the world's first operational atomic clock.

A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.

Description of the restoration of Jens Olsen's Astronomical Clock, a masterpiece in Copenhagen City Hall that consists of 15.448 individual parts.

A short history of the week and each day of the week.

Complete five-part explanation of time and how it is measured, including information about clocks, time zones, calendars, BC and AD.

Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.

Explanation of the roles of components of a wristwatch.

History of daylight saving time and how we use it to save energy.

Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.

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.

Horological index for organizations, clock and watch museums, related software, mailing lists and links. Maintained by Gordon T. Uber.

The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.

Core algorithm of international time scale has multiple metrology applications, from atomic clock frequency characterization to definition of the meter. Equation, explanation and publications.

Traditional horology website with information and mantainance tips. Technical descriptions and troubleshooting of escapements. Grandfather clocks, wall clocks, and watches.

The 24 hour analog clock and watch site. History, software, and the places to find clocks with 24 h dials.