6 trends tracked about this subject — the full history, oldest to newest below.
Leap seconds have kept world clocks in step with Earth’s spin for 27 adjustments, but timekeepers are now debating their demise.
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Global timekeepers face urgent adjustments as Earth's accelerating rotation threatens to force the scrap of the leap second.
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Global timekeeping authorities are considering replacing the leap second with a leap hour as the Earth's rotation speeds up.
6 news sources are covering this Science story right now — PULSE is tracking how fast it spreads.