समय मापन प्रौद्योगिकी की समयरेखा

3000 BC सिन्धु घाटी की सभ्यता में दाशमिक तौल के बाटों का उपयोग होता था।

 270 BC - Ctesibius builds a popular water clock, called a clepsydra

 46 BC - Julius Caesar and Sosigenes develop a solar calendar with leap years

 1000s - Sets of hourglasses were maintained by ship's pages to mark the progress of a ship during its voyage

 1000s - 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 - 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 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

इन्हें भी देखें 
 हिन्दू काल गणना
 होरा
 घड़ी

बाहरी कड़ियाँ 
 Hindu Kaala Vyavahara (Metrics of Time) : Superfine divisions of time by Hindus
 Time measurement in Hinduism

प्रौद्योगिकी का इतिहास