See also:

• Reference: Time: Alternative Systems  (6)

Abbey Clock Clinic - Mark Headrick's Horology Page - - Traditional horology website with information and mantainance tips. Technical descriptions and troubleshooting of escapements. Grandfather clocks, wall clocks, and watches.

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.

David Knight - Watchmaker from UK - - Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.

Daylight Saving Time - - History of daylight saving time and how we use it to save energy.

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.

The History of Clocks and Watches - - Learn about the history of clocks and watches, and discover the evolution of timekeeping devices from the first primitive sundials to the ultramodern atomic clocks. Includes a timeline.

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.

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

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.

How The Days of the Week Got Their Names - - A short history of the week and each day of the week.

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.

Layman's Guide to the Gent's Electric Turret Clock - - A Layman's Guide to the working and restoration of a Gent's Pulsynetic Waiting Train Electric Pendulum Turret Clock.

Leap Year Calculation for Year 2000 - - A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.

Leap Year Frequently Argued Questions - - A humorous approach towards explaining the nature of leap years, in particular why 2000 is a leap year.

Lincolnshire Branch of the British Horological Institute - - News, events, activities and general information maintained by BHI members.

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

Mark Frank's Home Page - - 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.

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

Online Clock Building - - Watch a master clockmaker building a clock movement from scratch. Hundreds of photos and drawings, plus a complete description of the process and CAD plans.

"Orologio" at the St. Mark's Square Tower, Venice - Antica Orologeria Zamberlan - - Website of Antica Orologeria Zamberlan, Italy. Extensive technical and historical explanation of the restoration and controversy of the "Orologio" Tower at St. Mark's Square, Venice.

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

Pulsynetic Electric Clocks - - Description, pictures and diagrams of many of the horological products made before 1945 By Gent's of Leicester GB, including a rare Observatory controlled transmitter.

R.A. Braithwaite - - Educational site Elliott clocks, how they are built and how to look after them.

UNITAS Reference Site - - UNITAS wristwatch and pocketwatch movements from 1898 to the present.