Chronometer watch

Chronometer Watch

Chronometer watch

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A chronometer watch is a specific type of watch tested and certified to meet certain precision standards. In Switzerland, only timepiece certified by the COSC may use the word 'Chronometer' on them.

The term chronometer was coined by Jeremy Thacker of Beverly, 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. This was the first of a series of chronometers which enabled accurate marine navigation. For the next 250 years, an accurate chronometer was essential to any kind of marine or air navigation until the implementation of global satellite navigation at the end of the 20th century. The marine chronometer is no longer used for navigation.

Once mechanical timepiece movement developed sufficient precision to allow for accurate marine navigation, there eventually developed what became known as "chronometer competitions" at astronomical observatories located in Europe. The Neuchatel Observatory, Geneva Observatory, Besancon Observatory, and Kew Observatory are prominent examples of observatories that certified the accuracy of mechanical timepieces. The observatory testing regime typically lasted for 30 to 50 days and contained accuracy standards that were far more stringent and difficult than modern standards such as those set by COSC. When a...
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