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How an accelerating Earth led experts to adopt the leap hour
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How an accelerating Earth led experts to adopt the leap hour

Here’s a fascinating shift in how we keep the world’s clocks in step: timekeepers from 69 countries have voted to replace leap seconds with a leap hour, starting next year. The change responds to Earth’s irregular rotation, which has recently sped up enough to raise the possibility of a tricky negative leap second. By letting coordinated universal time drift by as much as an hour before adjusting it, experts aim to spare computer networks and critical infrastructure from disruptive one-second changes - and that adjustment is not expected for thousands of years. So, we keep the link between clock time and Earth’s rotation while making timekeeping much easier for the digital systems we rely on.
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