Timeline of time measurement technology

   * 270 BC - Ctesibius builds a popular water clock
   * 46 BC - Julius Caesar and Sosigenes develop a solar calendar with leap
     years
   * 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
   * 1656 - Christian 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 nautical chronometer,
     thereby allowing for precise longitude determination while at sea
   * 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

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