Scientists voting at a meeting in France this week decided to abolish leap seconds, ending a practice that has been in place since 1972. During that 52-year period, officials added 27 leap seconds to the universal clock to keep it synchronized with Earth's rotation.
Leap seconds were introduced because Earth's rotation gradually slows over time. The atomic clocks used for Coordinated Universal Time (UTC) run at a constant rate, while Earth's day length changes slightly. Adding leap seconds prevented the official timekeeping system from drifting too far ahead of solar time, which is based on the sun's position in the sky.
The decision marks a significant shift in how the world will measure time going forward. Rather than continuing to insert occasional extra seconds into the clock, the international scientific community voted to let UTC run independently without these periodic adjustments. This means atomic time will gradually separate from Earth's rotation, but according to the decision, this drift will only accumulate to about one hour every 15,000 years.
The move addresses practical concerns that leap seconds have created for computer systems and digital infrastructure. Financial markets, telecommunications networks, and other technology-dependent systems have experienced glitches when leap seconds were introduced, as many programs were not designed to handle the extra second. By eliminating leap seconds, the new system will reduce these technical disruptions.
The meeting in France brought together international representatives responsible for maintaining global timekeeping standards. This decision represents a consensus among the world's timekeeping authorities that abolishing leap seconds will serve modern digital society better than continuing the current system.
Implementation of this change will occur at a future date to be determined, allowing time for systems worldwide to adapt to the new timekeeping method. The shift reflects how technological advancement has changed the practical requirements of global timekeeping since leap seconds were first introduced during the early era of atomic clocks.