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A common unit in both measures throughout historic Greece was the cotyle or cotyla whose absolute value varied from one place to another between 210 ml and 330 ml. [1] The basic unit for both solid and liquid measures was the κύαθος (kyathos, plural: kyathoi).
The measurement for silks was equal to 25 inches, and for linen and woolens it was equal to 27 inches. [4] The piki was sometimes regarded as equal to a metre and a kilometre was called a stadion. [4] The metre was introduced in a royal decree of 1836, and was originally subdivided in 10 palms, 100 digits and 1000 lines. [3]
Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.
In ancient Greece, the mina was known as the μνᾶ (mnâ). It originally equalled 70 drachmae but later, at the time of the statesman Solon (c. 594 BC), was increased to 100 drachmae. [12] The Greek word mna (μνᾶ) was borrowed from Semitic. [13] [14] Different city states used minae of different weights.
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It is possible to group official measurement systems for large societies into historical systems that are relatively stable over time, including: the Babylonian system, the Egyptian system, the Phileterian system of the Ptolemaic age, the Olympic system of Greece, the Roman system, the British system, and the metric system.
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Time metrology or time and frequency metrology is the application of metrology for timekeeping, including frequency stability. [28] [29] Its main tasks are the realization of the second as the SI unit of measurement for time and the establishment of time standards and frequency standards as well as their dissemination. [30]