How an accelerating Earth led experts to adopt the leap hour

Delegates from 69 countries approve clock changeover after decades of debate – but switch may not take effect for thousands of years After decades of discussion, quibbling and worrying about clocks in computer systems, the world’s official timekeepers have voted to replace what many viewed as a tiresome correction: the leap second.

It’s time, they say, for the leap hour.

Delegates from 69 countries cast their votes on Thursday at a conference in France of the International Bureau of Weights and Measures, which ensures the world sticks to the same standards of time, weight, distance and more.

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