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Horology (via Latin horologium from Greek ὡρολόγιον, from ὥρα hṓra "hour; time" and -o- interfix and suffix -logy; literally "the study of time") is the art or science of measuring time. Clocks, watches, clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers and atomic clocks are all examples of instruments used to measure time. In current usage, horology refers mainly to the study of mechanical time-keeping devices, while chronometry more broadly includes electronic devices that have largely supplanted mechanical clocks for the best accuracy and precision in time-keeping.
People interested in horology are called horologists. That term is used both by people who deal professionally with timekeeping apparatus (watchmakers, clockmakers), as well as aficionados and scholars of horology. Horology and horologists have numerous organizations, both professional associations and more scholarly societies.
There are many horology museums and several specialized libraries devoted to the subject. One example is the Royal Greenwich Observatory, which is also the source of the Prime Meridian (longitude 0° 0' 0"), and the home of the first marine timekeepers accurate enough to determine longitude (made by John Harrison). Other horological museums in the London area include the Clockmakers' Museum, which re-opened at the Science Museum in October 2015, and the horological collections at the British Museum, the Science Museum (London) and at the Wallace Collection.
One of the more comprehensive museums dedicated to horology is the Musée international d'horlogerie in La Chaux-de-Fonds (Switzerland). The Musée d'Horlogerie du Locle is smaller but located nearby. One of the better horological museums in Germany is the Deutsches Uhrenmuseum in Furtwangen im Schwarzwald, in the Black Forest. The two leading specialised horological museums in North America are the National Watch and Clock Museum in Columbia, Pennsylvania, and the American Clock and Watch Museum in Bristol, Connecticut.
The eastern French city of Besançon has the Musée du Temps (Museum of Time) in the historic Palais Grenvelle.
One of the most comprehensive horological libraries open to the public is the National Watch and Clock Library in Columbia, Pennsylvania. Other good horological libraries providing public access are at the Musée international d'horlogerie in Switzerland, at the Deutsches Uhrenmuseum in Germany, and at the Guildhall Library in London.
Notable scholarly horological organizations include:
- American Watchmakers-Clockmakers Institute – AWCI (United States of America)
- Antiquarian Horological Society – AHS (United Kingdom)
- British Horological Institute – BHI (United Kingdom)
- Chronometrophilia (Switzerland)
- Deutsche Gesellschaft für Chronometrie – DGC (Germany)
- National Association of Watch and Clock Collectors – NAWCC (United States of America)
- Geneva Time Exhibition
- Salon International de la Haute Horlogerie (SIHH)
|Chablon||French term for a watch movement (not including the dial and hands), that is not completely assembled.|
|Ébauche||French term (commonly used in English-speaking countries) for a movement blank, i.e., an incomplete watch movement sold as a set of loose parts—comprising the main plate, bridges, train, winding and setting mechanism, and regulator. The timing system, escapement, and mainspring, however, are not parts of the ébauche.|
|Établissage||French term for the method of manufacturing watches or movements by assembling their various components. It generally includes the following operations: receipt, inspection and stocking of the "ébauche", the regulating elements and the other parts of the movement and of the make-up; assembling; springing and timing; fitting the dial and hands; casing; final inspection before packing and dispatching.|
|Établisseur||French term for a watch factory that assembles watches from components it buys from other suppliers.|
|Factory, works||In the Swiss watch industry, the term manufacture is used of a factory that manufacturers watches almost completely, as distinct from an atelier de terminage, which only assembles, times, and fits hands and casing.|
|Manufacture d'horlogerie||French term for a watch factory that produces components (particularly the "ébauche") for its products (watches, alarm and desk clocks, etc.).|
|Terminage||French term denoting the process of assembling watch parts for the account of a producer.|
|Termineur||French term for an independent watchmaker (or workshop) engaged in assembling watches, either wholly or in part, for the account of an "établisseur" or a "manufacture", who supply the necessary loose parts. See "atelier de terminage" above.|
- History of timekeeping devices
- Hora (astrology)
- List of clock manufacturers
- List of watch manufacturers
- System time
- Winthrop Kellogg Edey
- The Bone Clocks
- Beckett, Edmund, A Rudimentary Treatise on Clocks, Watches and Bells, 1903, from Project Gutenberg
- Berner, G.A., Illustrated Professional Dictionary of Horology, Federation of the Swiss Watch Industry FH 1961 - 2012
- Daniels, George, Watchmaking, London: Philip Wilson Publishers, 1981 (reprinted June 15, 2011)
- Grafton, Edward, Horology, a popular sketch of clock and watch making, London: Aylett and Jones, 1849
- Perman, Stacy, A Grand Complication: The Race to Build the World's Most Legendary Watch, Atria Books (Simon & Schuster), February 2013. ISBN 9781439190081
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