Chronometrical



[kruh-nom-i-ter] /krəˈnɒm ɪ tər/

noun
1.
a timepiece or timing device with a special mechanism for ensuring and adjusting its accuracy, for use in determining longitude at sea or for any purpose where very exact measurement of time is required.
2.
any timepiece, especially a wristwatch, designed for the highest accuracy.
/krəˈnɒmɪtə/
noun
1.
a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea
n.

1735, from chrono- “time” + -meter. Related: Chronometric.
chronometer
(krə-nŏm’ĭ-tər)
An extremely accurate clock or other timepiece. Chronometers are used in scientific experiments, navigation, and astronomical observations. It was the invention of a chronometer capable of being used aboard ship, in 1762, that allowed navigators for the first time to accurately determine their longitude at sea.

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