International Atomic Time - International Atomic Time
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The time is based on a unit of 1 second (atomic second) defined by the cesium atomic clock, and began at midnight on January 1, 1958 (Showa 33), Universal Time. It is managed by the International Bureau of Weights and Measures and is determined by taking a weighted average of the times indicated by atomic clocks around the world. TAI (Temps Atomique International). → Coordinated Universal Time Source: About Shogakukan Digital Daijisen Information | Legend |
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セシウム原子時計で定義される1秒（原子秒）を単位とし、世界時の1958年（昭和33）1月1日零時を原子時零時として始動した時刻。国際度量衡局が管理しており、世界各地にある原子時計の示す時刻を加重平均して決定される。TAI（Temps Atomique International）。→協定世界時
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