Horology

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

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

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

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/

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

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/

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

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/

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

Functionning of a Simple Mechanical Watch - Explanation of the roles of components of a wristwatch.
http://collectorebooks.com/watch2/watch01.htm

David Knight - Watchmaker from UK - Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.
http://www.davidknightwatchmaker.com/

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

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

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/

The Horology Source - Gateway to all aspects of clocks, watches, timekeeping, and the science of horology.
http://www.horologysource.com

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

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

"Orologio" at the St. Mark's Square Tower, Venice - Antica Orologeria Zamberlan - Website of Antica Orologeria Zamberlan, Italy. Includes 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

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

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/

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

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