Timeline of time measurement technology

Timeline of time measurement technology

• 270 BC - Ctesibius builds a popular water clock\n* 46 BC - Julius Caesar and Sosigenes develop a solar calendar with leap years\n* 1000s - Sets of hourglasses were maintained by ship's pages to mark the progress of a ship during its voyage\n* 1000s - Large town clocks were used in Europe to display local time, maintained by hand\n* 1335 - First known mechanical clock, in Milan\n* 1502 - Peter Henlein builds the first pocketwatch\n* 1582 - Pope Gregory XIII, Aloysius Lilius, and Christopher Clavius introduce a Gregorian calendar with an improved leap year system\n* 1656 - Christian Huygens builds the first accurate pendulum clock\n* 1676 - Motion works and minute hand introduced by Daniel Quare\n* 1680 - Second hand introduced \n* 1737 - John Harrison presents the first stable nautical chronometer, thereby allowing for precise longitude determination while at sea\n* 1884 - International Meridian Conference adopts Greenwich Mean Time for consistency with Nevil Maskelyne's 18th century observations for the Method of Lunar Distances\n* 1928 - Joseph Horton and Warren Morrison build the first quartz crystal oscillator clock\n* 1946 - Felix Bloch and Edward Purcell develop nuclear magnetic resonance\n* 1949 - Harold Lyons develops an atomic clock based on the quantum mechanical vibrations of the ammonia molecule\n* 2008 - Launch date for the Primary Atomic Reference Clock in Space.

See also: clock Category:Technology timelines\nCategory:Time\n\n