How, and whether, to keep atomic time in sync with Earth’s rotation is still up for debate
The practice of adding ‘leap seconds’ to official clocks to keep them in sync with Earth’s rotation will be put on hold from 2035, the world’s foremost metrology body has decided.
Leap seconds aren’t predictable, because they depend on to Earth’s natural rotation. They disrupt systems based on precise timekeeping, Macdonald says, and can wreak havoc in the digital age. Facebook’s parent company, Meta, and Google are among the tech companies that have called for leap seconds to be scrapped.
The Russian system incorporates leap seconds, while the Global Position System and others already effectively ignore them. The decision means that Russia might need to install new satellites and ground stations, says Felicitas Arias, former director of the Time Department at the International Bureau of Weights and Measures in Sèvres, France.
There is a chance that the International Telecommunications Union could stymie plans to make the switch in 2035. The body effectively ceded decision making about the leap second to the CGPM in 2015, and Arias says its working group agreed with the CGPM’s proposal. But the ITU remains in control of disseminating UTC, and could argue that the time is not right to make the change, she says. “This is the thing that makes us a little bit nervous.
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