horology

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horology

horology , science of measuring time and technology of constructing instruments for its measurement or recording. Early measurements of the passage of time were based on observations of seasonal cycles and of the apparent motion of celestial bodies. Shorter intervals were measured by observing the shadow cast by an upright object; the shadow clock and the sundial were probably the first devices constructed. Later came the hourglass and the clepsydra and finally the clock and the watch . The most accurate type of timekeeping device in existence today is the atomic clock . Highly accurate time, which is necessary for such purposes as navigation and the tracking of artificial satellites, is provided throughout the world by time signals that are transmitted by certain radio stations.

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"horology." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 20 Dec. 2009 <http://www.encyclopedia.com>.

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horology

The Oxford Pocket Dictionary of Current English | 2009 | © The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

ho·rol·o·gy / həˈräləjē/ • n. the study and measurement of time. ∎ the art of making clocks and watches. DERIVATIVES: ho·rol·o·ger / -jər/ n. hor·o·log·ic / ˌhôrəˈläjik/ adj. hor·o·log·i·cal / ˌhôrəˈläjikəl/ adj. ho·rol·o·gist / -jist/ n.

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horologe

The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

horologe timepiece, clock. XIV. — OF. or(i)loge (mod. horloge) :- L. hōrologium — Gr. hōrólogion, f. hōrológos, f. hðrā time, HOUR + -logos telling (see -LOGUE).

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T. F. HOAD. "horologe." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 20 Dec. 2009 <http://www.encyclopedia.com>.

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	ISLAND WATCHMAKER AT INTERNATIONAL SHOW. Newspaper article from: Isle of Man Newspapers (Douglas, England); 5/4/2006

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