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.

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

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

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

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

A brief history of time keeping. How mankind has used the sun, water, candles, sand, pendulums, springs, electronics, tuning forks, and quartz crystals, to tell time.

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

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.

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

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

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.

A very basic introduction to how electric clocks work, with animated pictures. Also a collection of cheap electric clocks with pictures and descriptions.

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

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

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

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

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

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

A humorous approach towards explaining the nature of leap years, in particular why 2000 is a leap year.

News, events, activities and general information maintained by BHI members.

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

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.

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

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.

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

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.

Educational site Elliott clocks, how they are built and how to look after them.

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.

Descriptions, photos and history of tower clocks in the world (English, Español, Português).

UNITAS wristwatch and pocketwatch movements from 1898 to the present.