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Chronometry is the science of the measurement of time, or timekeeping. Chronometry provides a standard of measurement for time, and therefore serves as a significant reference for many and various fields of science.
The importance of the accuracy and reliability of measuring time provides a standardized unit for chronometric experiments for the modern world, and more specifically scientific research. Despite the coincidental identicality of worldwide units of time, time produces a measurement of change and is a variable in many experiments. Therefore, time is an essential part of many areas of science.
It should not to be confused with chronology, the science of locating events in time, which often relies upon it. Also, of similarity to chronometry is horology, the study of time, however it is commonly used specifically with reference to the mechanical instruments created to keep time, with examples such as stopwatches, clocks, and hourglasses. Chronometry is utilised in many areas, and its fields are often derived from aspects of other areas in science, for example geochronometry, combining geology and chronometry.
Early records of time keeping are thought to have originated in the Paleolithic era, with etchings to mark the passing of moons in order to measure the year. And then progressed to written versions of calendars, before mechanisms and devices made to track time were invented. Today, the highest level of precision in timekeeping comes with atomic clocks, which are used for the international standard of the second.