DBpedia – Linked Data Fragments

Matches in DBpedia 2015-10 for { ?s ?p "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"@en }

• Timeline_of_time_measurement_technology abstract "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".