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The Horology Source

http://www.horologysource.com/

Gateway to all aspects of clocks, watches, timekeeping, and the science of horology.

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Pocket Horology

http://www.pockethorology.org/

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

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On Time

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

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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Mark Frank's Home Page

http://www.my-time-machines.net/

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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Louis Essen

http://www.btinternet.com/~time.lord/

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

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Leap Year Calculation for Year 2000

http://h71000.www7.hp.com/openvms/products/year-2000/leap.html

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

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Jens Olsen's Astronomical Clock

http://www.ateliera.dk/olsen.htm

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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How Stuff Works: Time

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

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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Horology - The Index

http://www.nawcc-index.net/

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

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Daylight Saving Time

http://webexhibits.org/daylightsaving/

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

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David Knight - Watchmaker from UK

http://www.davidknightwatchmaker.com/

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

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Cumbria Clock Company

http://www.clockmaker.co.uk/

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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Clocks and Time

http://www.ubr.com/clocks/

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

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Antique Horology

http://www.antique-horology.org/

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

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Allan Variance -- Overview by David W. Allan

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

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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Abbey Clock Clinic - Mark Headrick's Horology Page

http://www.abbeyclock.com/

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

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24 hour analog clocks

http://homepage.mac.com/pete.boardman/24hourclock/

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

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