Astronomical Timekeeping 54
Museums 6
Sky Calendars 15
| | Alternative Systems - Time, Reference 5
 Abbey Clock Clinic - Mark Headrick's Horology PageAbbey 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.
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Allan Variance -- Overview by David W. AllanAllan 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.
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Antique HorologyAntique Horology
 The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
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Clocks and TimeClocks and Time
 Horological index for organizations, clock and watch museums, related software, mailing lists and links. Maintained by Gordon T. Uber.
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Cumbria Clock CompanyCumbria 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.
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David Knight - Watchmaker from UKDavid Knight - Watchmaker from UK
 Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.
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Daylight Saving TimeDaylight Saving Time
 History of daylight saving time and how we use it to save energy.
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Functionning of a Simple Mechanical WatchFunctionning of a Simple Mechanical Watch
 Explanation of the roles of components of a wristwatch.
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Hampton Court ClockHampton 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.
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The History of Clocks and WatchesThe 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.
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The Horology SourceThe Horology Source
 Gateway to all aspects of clocks, watches, timekeeping, and the science of horology.
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Horology.comHorology.com
 Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.
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24 hour analog clocks24 hour analog clocks
 The 24 hour analog clock and watch site. History, software, and the places to find clocks with 24 h dials.
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How Stuff Works: TimeHow Stuff Works: Time
 Complete five-part explanation of time and how it is measured, including information about clocks, time zones, calendars, BC and AD.
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How The Days of the Week Got Their NamesHow The Days of the Week Got Their Names
 A short history of the week and each day of the week.
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Jens Olsen's Astronomical ClockJens 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.
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Leap Year Calculation for Year 2000Leap Year Calculation for Year 2000
 A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.
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Louis EssenLouis Essen
 Autobiography of the physicist who built the world's first operational atomic clock.
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Ludwig OechslinLudwig Oechslin
 Curator at the Musée International d’Horlogerie (international watch museum) in La Chaux- de - Fonds, Switzerland. He has designed some of the most complex wristwatches in history.
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Mark Frank's Home PageMark 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.
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National Association of Watch and Clock CollectorsNational Association of Watch and Clock Collectors
 Organization of watch and clock enthusiasts.
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On TimeOn Time
 The Smithsonian Institute's exhibition on the changing ways we have measured, used, and thought about time over the past three hundred years.
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"Orologio" at the St. Mark's Square Tower, Venice - Antica Orologeria Zamberlan"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.
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Pocket HorologyPocket Horology
 National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.
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UNITAS Reference SiteUNITAS Reference Site
 UNITAS wristwatch and pocketwatch movements from 1898 to the present.
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