"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.
   http://www.orologeria.com/english/tower/index.htm

24 hour analog clocks
   The 24 hour analog clock and watch site. History, software, and the places to find clocks with 24 h dials.
   http://homepage.mac.com/pete.boardman/24hourclock/

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.
   http://www.abbeyclock.com/

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.
   http://www.allanstime.com/AllanVariance/

Antique Horology
   The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
   http://www.antique-horology.org/

Clock a History
   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.
   http://www.ernie.cummings.net/clock.htm

Clocks and Time
   Horological index for organizations, clock and watch museums, related software, mailing lists and links. Maintained by Gordon T. Uber.
   http://www.ubr.com/clocks/

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.
   http://www.clockmaker.co.uk

David Knight - Watchmaker from UK
   Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.
   http://www.midknight.fsnet.co.uk/david.html

Daylight Saving Time
   History of daylight saving time and how we use it to save energy.
   http://webexhibits.org/daylightsaving/

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.
   http://pages.zoom.co.uk/cosmicelk/hamptoncourtclock.htm

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.
   http://home.clara.net/steve.thackery/clocks/horindex.htm

Horology.com
   Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.
   http://www.horology.com/

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.
   http://www.howstuffworks.com/time.htm

How The Days of the Week Got Their Names
   A short history of the week and each day of the week.
   http://www.indepthinfo.com/weekdays/index.shtml

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.
   http://www.ateliera.dk/olsen.htm

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.
   http://mysite.wanadoo-members.co.uk/waitingtrain/index.jhtml

Leap Year Calculation for Year 2000
   A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.
   http://h71000.www7.hp.com/openvms/products/year-2000/leap.html

Leap Year Frequently Argued Questions
   A humorous approach towards explaining the nature of leap years, in particular why 2000 is a leap year.
   http://world.std.com/%7Edpbsmith/leapyearfaq.txt

Lincolnshire Branch of the British Horological Institute
   News, events, activities and general information maintained by BHI members.
   http://homepage.ntlworld.com/heather.hobden1/lincsbhi.htm

Louis Essen
   Autobiography of the physicist who built the world's first operational atomic clock.
   http://www.btinternet.com/~time.lord/

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.
   http://www.my-time-machines.net

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.
   http://americanhistory.si.edu/ontime/

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.
   http://www.onlineclockbuilding.com

Pocket Horology
   National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.
   http://www.pockethorology.org/

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.
   http://mysite.wanadoo-members.co.uk/Pulsynetic

R.A. Braithwaite
   Educational site Elliott clocks, how they are built and how to look after them.
   http://www.braithwaitesjewellers.co.uk

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.
   http://home.rochester.rr.com/kjmpage/clockshistory.html

Towerclocks.org - Towerclocks in the World
   Descriptions, photos and history of tower clocks in the world (English, Español, Português).
   http://www.towerclocks.org

UNITAS Reference Site
   UNITAS wristwatch and pocketwatch movements from 1898 to the present.
   http://www.unitas.netfirms.com