Standard clock - hyojundokei
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A highly accurate clock that serves as the standard for time. It has the significance of being a prototype. It developed from a highly accurate pendulum clock that was used to adjust the daily difference when manufacturing or repairing clocks in the 17th century. With the advent of quartz clocks, the accuracy became 1 to 0.1 microseconds per day, and furthermore, atomic clocks have an error of 1 second every tens of thousands of years. Source : Heibonsha Encyclopedia About MyPedia Information |
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時刻の標準となる精度の高い時計。原器的な意味をもつ。17世紀時計の製造や修理の際に日差を調整するのに用いられた高精度の振子時計から発達，水晶時計の出現で１日当り１〜0.1マイクロ秒の精度となり，さらに原子時計では数万年に１秒の誤差にまでなっている。
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