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Climate change and polar melting redistribute mass of the planet, slightly slow the Earth, and postpone the second negative leap second, avoiding a rare adjustment that could disrupt computational systems
The second leap second has always been a kind of “course correction” for our official time: when the Earth does not align perfectly with atomic time, an adjustment is made so that UTC does not drift from astronomical time. For decades, the trend was for the Earth to slow down, and from time to time, the solution was to add a second.
However, the situation changed when measurements began to indicate that the Earth is spinning faster. If this acceleration continues, the unprecedented solution would be to drop a second, the so-called negative leap second. The basis indicates that this was considered for 2026, but the scenario changed and the adjustment has been postponed to 2029.
Why there were leap seconds in the Earth’s clock
Metrologists needed, for many years, to add a leap second to clocks because the Earth traditionally slowed down. The cited explanation involves the friction of the tides caused by the Moon, making the days a little longer than the “theoretical” 86,400 seconds.
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This detail is invisible to almost everyone’s routine, but it is crucial to keep Coordinated Universal Time aligned with astronomical time. It is a tiny difference, but it accumulates.
What changes when the Earth accelerates and the negative leap second enters
When the Earth slows down, a second is added. When the opposite happens, the adjustment would be to drop a second to prevent UTC from drifting from astronomical time.
The basis makes it clear that this would not be noticeable to people in their daily lives, but it could have real implications for digital infrastructure. That is precisely why the possibility of a negative leap second attracted so much attention.
The “skate effect” and how polar melting affects rotation
The central explanation of the basis uses a very easy-to-visualize image: the “skate effect.” A skater who wants to slow down opens their arms; to speed up, they pull their arms in close to their body.
Applying this to the planet, when polar ice melts, the mass of water redistributes and spreads more around the equator, as if the Earth were “opening its arms.” This mass displacement further from the axis of rotation, due to the conservation of angular momentum, tends to slow the planet’s spin.
From 2026 to 2029: how melting “pushed” the adjustment
According to the database, scientists calculated that the massive melting in Greenland and Antarctica postponed the need for a second negative leap second from 2026 to 2029.
The reading is that this brake caused by mass redistribution would have counterbalanced and surpassed the acceleration that had been detected earlier, changing the forecast for when it would be necessary to drop a second.
What recent data suggests about the length of the day
The database states that real-time measurements have begun to support this change in direction. It cites that more recent bulletins from the IERS show new positive values for the length of the day, suggesting that the acceleration has ceased and that the Earth is slightly decelerating again.
This aligns with research cited in the database stating that, between 2000 and 2020, days lengthened at a rate of 1.33 milliseconds per century due to ice melting, with the mass redistribution from climate change dominating rotation and even surpassing the historical effect of lunar friction.
The risk to computational systems and why manipulating time has become a problem
According to the source, it highlights that networks and digital infrastructure can suffer when time is “manipulated,” and even states that the practice of adding or subtracting seconds should not last forever, citing a decision from the International Bureau of Weights and Measures to eliminate it starting in 2025.
It’s the kind of detail that helps to understand why an extra second or less, which seems trivial on the kitchen clock, can become a sensitive event for systems that require perfect synchronization.
In the end, it gives a strange feeling: a rare adjustment was postponed due to a side effect of climate change. When you think about it, what seems more fragile in this story, the behavior of the Earth or the dependence that digital infrastructure has on a time fixed to the millisecond?
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