On new year's day "leap second" 9:00 ago second adjustment
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world standard time to adjust to the Earth's rotation for one day leap seconds to one second longer to adjust 1, 9:00 before the year was done in half.
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JAPANESE
世界の標準時を地球の自転に合わせるため、１日を１秒長くする「うるう秒」の調整が、１日午前９時前、１年半ぶりに行われました。