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Back「うるう秒」実質廃止決定 ずれ1時間まで許容―国際度量衡総会
「うるう秒」実質廃止決定 ずれ1時間まで許容―国際度量衡総会
Science
時事通信10 hours agoScience2 min readJapanView translation

「うるう秒」実質廃止決定 ずれ1時間まで許容―国際度量衡総会

Quick Look

国際度量衡総会はフランスで開催され、地球の自転と原子時計のずれを調整するうるう秒を実質的に廃止すると決定した。2027年5月からずれを1時間まで許容することで、数世紀にわたる調整の必要がなくなり、システムの誤作動リスクを低減させる見込み。

AI-generated summary

Why It Matters

うるう秒は1972年から採用されており、これまでに27回実施されてきた。原子時計に基づく時間に1秒を加える調整だったが、コンピューターや通信システムにトラブルを引き起こす恐れがあった。

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世界共通の単位を確立するための国際会議「国際度量衡総会」が15日、フランスで開かれ、地球の自転と原子時計との間に生じる時間のずれを調整する「うるう秒」を実質的に廃止すると正式に決めた。うるう秒によるシステムの誤作動が懸念されていたが、2027年5月からは、ずれを1時間(3600秒)まで許容することで、数世紀にわたり調整の必要がなくなる見込み。

【特集】うるう秒ってな~に?~時間の不思議~

産業技術総合研究所によると、うるう秒は1972年から採用された。これまで、高精度で誤差の少ない原子時計に基づく時間に1秒を加える調整が27回実施された。1秒を加えることで、コンピューターや通信システムにトラブルを引き起こす恐れがあった。将来的には1秒を差し引く作業も必要になる可能性があり、その場合は危険性がより大きいと懸念されていた。

ずれを1時間まで許容すれば数百年にわたり調整の必要性がなくなる見通しで、調整に伴うトラブル発生のリスクを低減させることにつながる。

Open Questions

  • 1時間のずれを許容する具体的な調整方法は何か
  • 今後、ずれが1時間を超えた場合の対応はどうなるか
  • この決定が関連する国際条約や法律に与える影響は何か

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This article was originally published by 時事通信.

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