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The ’leap second’ could disappear. How a minor time adjustment became a major problem - Radio-Canada

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Photo credit : Clockmaker Scott Gow adjusts the hands of a clock at the Electric Time Company in Medfield, Mass., in 2024. An international body is voting Thursday to determine the future of 'leap second' time changes.

RCIPosted: October 15, 2026 11:10 AMKevin Maimann (new window) · CBC News ·For more than 50 years, humanity has used « leap seconds » to keep our clocks aligned with the rotation of the Earth. On Thursday, an international timekeeping body in France is expected to do away with leap seconds and let the clocks slip until they're out of alignment by a full hour, which could take centuries or even millennia.

The precise atomic time we use to track our days — developed in the 1950s and measured by tracking the natural vibrations of atoms — is slightly out of sync with solar time, which is based on the position of the sun in the sky relative to a specific location on Earth, because the planet's rotation has been gradually slowing.

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