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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Timeline of time measurement technology ： ウィキペディア英語版 Timeline of time measurement technology Timeline of time measurement technology * 270 BCE - Ctesibius builds a popular water clock, called a clepsydra * 46 BCE - Julius Caesar and Sosigenes develop a solar calendar with leap years * 11th century - Sets of hourglasses were maintained by ship's pages to mark the progress of a ship during its voyage * 11th century - Large town clocks were used in Europe to display local time, maintained by hand * 1335 - First known mechanical clock, in Milan * 1502 - Peter Henlein builds the first pocketwatch * 1582 - Pope Gregory XIII, Aloysius Lilius, and Christopher Clavius introduce a Gregorian calendar with an improved leap year system * 1655 - Cassini builds (the heliometer of San Petronio ) in Bologna, to standardise Solar noon. * 1656 - Christiaan Huygens builds the first accurate pendulum clock * 1676 - Motion works and minute hand introduced by Daniel Quare * 1680 - Second hand introduced * 1737 - John Harrison presents the first stable marine chronometer, thereby allowing for precise longitude determination while at sea * 1850 - Aaron Lufkin Dennison starts in Roxbury, Mass.U.S.A. the Waltham Watch Company and develops the American System of Watch Manufacturing. * 1884 - International Meridian Conference adopts Greenwich Mean Time for consistency with Nevil Maskelyne's 18th century observations for the Method of Lunar Distances * 1893 - Introduction by Webb C. Ball of the General Railroad Timepiece Standards in North America: Railroad chronometers * 1928 - Joseph Horton and Warren Morrison build the first quartz crystal oscillator clock * 1946 - Felix Bloch and Edward Purcell develop nuclear magnetic resonance * 1949 - Harold Lyons develops an atomic clock based on the quantum mechanical vibrations of the ammonia molecule * 1982 - The Federation of the Swiss Watch Industry FH is founded by the merger of two previous organisations * 1983 - Radio-controlled clocks become common place in Europe * 1994 - Radio-controlled clocks become common place in USA ==External links== * (www.germanclocks.org ) - for a comprehensive view of a timeline of horology 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timeline of time measurement technology」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.