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	Daylight Saving Time - http://webexhibits.org/daylightsaving/ History of daylight saving time and how we use it to save energy.
	http://americanhistory.si.edu/ontime/ - 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.
	National Association of Watch and Clock Collectors - http://www.nawcc.org/ Organization of watch and clock enthusiasts.
	Horology.com - http://www.horology.com Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.
	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.

	Antique Horology - http://www.antique-horology.org/ The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
	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.
	The Horology Source - http://www.horologysource.com Gateway to all aspects of clocks, watches, timekeeping, and the science of horology.
	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.
	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.

	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.
	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.
	UNITAS Reference Site - http://www.unitas.netfirms.com UNITAS wristwatch and pocketwatch movements from 1898 to the present.
	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.
	Pocket Horology - http://www.pockethorology.org/ National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.

	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.
	Louis Essen - http://www.btinternet.com/~time.lord/ Autobiography of the physicist who built the world's first operational atomic clock.
	"Orologio" at the St. Mark's Square Tower, Venice - Antica Orologeria Zamberlan - http://www.orologeria.com/english/tower/index.htm 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.
	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.
	David Knight - Watchmaker from UK - http://www.davidknightwatchmaker.com/ Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.

	How The Days of the Week Got Their Names - http://www.indepthinfo.com/weekdays/index.shtml A short history of the week and each day of the week.
	Functionning of a Simple Mechanical Watch - http://collectorebooks.com/watch2/watch01.htm Explanation of the roles of components of a wristwatch.
	Ludwig Oechslin - http://www.ulysse-nardin.com/index2.jsp?ID_Page=10000L 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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