समय मापन प्रौद्योगिकी की समयरेखा का स्रोत देखें

* 3000 BC [[सिंधु घाटी सभ्यता|सिन्धु घाटी की सभ्यता]] में दाशमिक तौल के बाटों का उपयोग होता था।

* 270 BC - [[Ctesibius]] builds a popular [[water clock]], called a [[water clock|clepsydra]]

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

* 1000s - Sets of [[hourglass]]es were maintained by ship's pages to mark the progress of a ship during its voyage

* 1000s - Large [[town clock]]s 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 - [[Giovanni Domenico Cassini|Cassini]] builds [https://web.archive.org/web/20110413205139/http://cis.alma.unibo.it/NewsLetter/090496Nw/Heilbron.htm 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#The first three marine timekeepers|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 clock|quartz crystal oscillator clock]]

* 1946 - [[फीलिक्स ब्लाख|Felix Bloch]] and [[Edward Mills Purcell|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 - [[Watch#Radio-controlled movements|Radio-controlled clocks]] become common place in Europe

* 1994 - [[Watch#Radio-controlled movements|Radio-controlled clocks]] become common place in USA

== इन्हें भी देखें ==
* [[हिन्दू काल गणना]]
* [[होरा]]
* [[घड़ी]]

== बाहरी कड़ियाँ ==
* [https://web.archive.org/web/20100917143623/http://1stholistic.com/Prayer/Hindu/hol_Hindu-metrics-of-time.htm Hindu Kaala Vyavahara (Metrics of Time) : Superfine divisions of time by Hindus]
* [https://web.archive.org/web/20160304130644/http://gaurakrishna.org/english/pdf/Gaura%20Krishna%20-%20Time%20measurement%20in%20Hinduism.pdf Time measurement in Hinduism]

[[श्रेणी:प्रौद्योगिकी का इतिहास]]