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2. Chronograph - Wikipedia

   en.wikipedia.org/wiki/Chronograph

   The term chronograph is often confused with the term chronometer. Where "Chronograph" refers to the function of a watch, chronometer is a measure of how well a given mechanical timepiece performs: in order to be labeled a chronometer the timepiece must be certified by the COSC, the official Swiss Chronometer testing institute, [20] after ...

3. Chronometer watch - Wikipedia

   en.wikipedia.org/wiki/Chronometer_watch

   The term chronometer was coined by Jeremy Thacker of Beverley, England in 1714, referring to his invention of a clock ensconced in a vacuum chamber. The term chronometer is also used to describe a marine chronometer used for celestial navigation and determination of longitude. The marine chronometer was invented by John Harrison in 1730.

4. Watch - Wikipedia

   en.wikipedia.org/wiki/Watch

   A chronograph is a watch with an added duration timer, often a stopwatch complication (as explained above), while a chronometer watch is a timepiece that has met an industry-standard test for performance under pre-defined conditions: a chronometer is a high quality mechanical or a thermo-compensated movement that has been tested and certified ...

5. Marine chronometer - Wikipedia

   en.wikipedia.org/wiki/Marine_chronometer

   A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

6. Complication (horology) - Wikipedia

   en.wikipedia.org/wiki/Complication_(horology)

   Chronograph, with a second hand that can be stopped and started to function as a stopwatch. Double chronograph or rattrapante, multiple second hands for split-second, lap timing or timing multiple events; Flyback chronograph, allowing rapid reset of the chronograph as it is running; Counter chronograph; Independent second-hand chronograph

7. Chronometry - Wikipedia

   en.wikipedia.org/wiki/Chronometry

   Because of the inherent relation between chronos and kairos, their function the Ancient Greek's portrayal and concept of time, understanding one means understanding the other in part. The implication of chronos, an indifferent disposition and eternal essence lies at the core of the science of chronometry, bias is avoided, and definite ...