There are two different headlines describe the exact same planet—but on completely different timescales.

• Earth’s Rotation Just Hit a New Record— Here’s What That Means for Us
• Earth’s Spin Is Slowing at a Pace Not Seen in Millions of Years—and You Can Guess Why

They don’t contradict each other; they layer on top of one another like waves on a slowly drifting ocean.

Here’s exactly how they fit together, based on the latest data as of March 2026.

The 2025 Headline: “Earth’s Rotation Just Hit a New Record— Here’s What That Means for Us”

This refers to temporary speedups in Earth’s spin that produced some of the shortest days ever recorded (June–August 2025 coverage, e.g., The Daily Galaxy, CNN, TIME, Live Science).

• On dates like July 9, July 22, and August 5, 2025, Earth rotated up to 1.3–1.6 milliseconds faster than the standard 86,400-second day.
• These were among the shortest days since atomic-clock measurements began in the 1970s (previous record: –1.66 ms on July 5, 2024).
• Causes: Short-term geophysical “noise” — shifts in Earth’s molten core, atmospheric winds, ocean currents, and seasonal effects. These can temporarily transfer angular momentum and speed up the planet.

Result: Headlines about possibly needing a negative leap second for the first time ever (to keep clocks synced). But these were blips — reversible and unnoticeable in daily life.

The 2026 Headline: “Earth’s Spin Is Slowing at a Pace Not Seen in Millions of Years—and You Can Guess Why”

This is the brand-new scientific study published just days ago (March 12–13, 2026) by researchers from the University of Vienna and ETH Zurich in the Journal of Geophysical Research: Solid Earth.

• Earth’s rotation is currently slowing down, lengthening the average day by 1.33 milliseconds per century (0.0133 ms per year).
• This rate is unprecedented in at least 3.6 million years (back to the Late Pliocene).
• Main driver right now: Human-caused climate change — melting ice sheets and glaciers raise sea levels, moving mass from the poles toward the equator, increasing Earth’s moment of inertia and braking the spin (like a figure skater extending their arms).

The researchers used fossil shells of benthic foraminifera to reconstruct ancient sea levels and day lengths over millions of years. The modern climate signal stands out dramatically against natural ice-age cycles and the Moon’s long-term tidal slowing (~2–3 ms/century baseline).

How They Work Together (The Full Picture)

Earth’s rotation varies on multiple overlapping timescales:

1. Short-term (days to years): Fluctuations from core dynamics, atmosphere, and oceans — can speed up rotation (2025 “shortest days” records). These are the flashy headlines that grab attention.
2. Decadal to centennial: The underlying slowdown trend, here supercharged by climate change.
3. Geological (millions of years): The Moon has been slowing Earth for billions of years, but nothing matches the current anthropogenic acceleration.

In essence:

• One headline captures exciting, temporary anomalies (faster spin → shorter days).
• The other reveals the profound, human-amplified geological change (slower spin → longer days, unprecedented in millions of years).

Both are true, just at different timescales.

The millisecond-scale wiggles don’t contradict the century-scale trend—they’re superimposed on it. The real planetary-scale news in 2026 is the climate link to the unprecedented slowdown, adding yet another measurable way we’re reshaping Earth.

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Earth’s Rotation Just Hit a New Record— Here’s What That Means for Us

From The Daily Galaxy

By Melissa Ait Lounis

Earth is spinning faster than ever, and the result is a shortening of the length of our days. Since 2020, each year has brought records for the shortest day ever, with Earth’s spin accelerating by milliseconds. As we approach mid-2025, experts are predicting that Earth’s rotation could once again break records. In fact, some forecasts suggest that Earth will soon experience its fastest-ever rotation, bringing us even closer to the shortest day since records began in 1973.

The Race Against Time

Normally, Earth takes 24 hours—or exactly 86,400 seconds—to complete one full rotation. This has been the standard for measuring time for centuries, but recent data shows that the planet has been rotating faster than ever before. On July 19, 2020, Earth set a new milestone by completing its daily rotation 1.47 milliseconds shorter than 86,400 seconds. This wasn’t a one-off event; the trend has continued since then. Just one year later, on July 5, 2021, the planet’s spin was even quicker, shortening the day by 1.66 milliseconds.

Experts, including those from Timeanddate.com and the International Earth Rotation and Reference Systems Service (IERS), suggest that Earth could set another record on or around July 9, July 22, or August 5, 2025. This marks a continued acceleration in the planet’s rotation, though the exact timing remains uncertain.

Why Earth Is Spinning Faster?

The exact cause of Earth’s increasing rotation speed remains a mystery, though scientists have several theories. A combination of factors is likely responsible for this acceleration. Changes in the movement of Earth’s core, shifts in mass due to the melting of glaciers, and variations in ocean currents are all potential contributors. Also, the “Chandler wobble,” the slow movement of Earth’s geographic poles, may also be influencing the planet’s spin.

For context, Earth’s rotation has been gradually slowing for centuries. However, the recent trend in acceleration is perplexing to researchers. The melting of large ice sheets and glaciers, for example, has redistributed mass on the planet, potentially altering the rate at which Earth rotates. Scientists believe this could lead to slight variations in the length of each day, with these changes being small but measurable on atomic clocks.

Read the full story here.

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Earth’s Spin Is Slowing at a Pace Not Seen in Millions of Years—and You Can Guess Why

From Gizmodo

By Matthew Phelan

The new study described this “almost unprecedented rate of increase” in the length of an average day as a quantifiable consequence of Earth’s rising oceans.

It often feels like the world is spinning faster and faster, just out of control these days, right? Well, I’m sorry to report that this visceral first impression appears to be wrong: New research suggests planet Earth’s spin has been slowing down dramatically.

Geophysics researchers in Vienna and Zurich have deployed paleoclimate data, primarily global sea level variations since the Late Pliocene, to provide the broadest estimate yet on the changing rate of Earth’s rotation. They’ve found that from 2000 to 2020, our days have gotten longer by roughly 1.33 milliseconds (ms) per century—the most rapidly that Earth’s spin has slowed down since the time of gigantic mastodons and saber-toothed cats.

“This rapid increase in day length implies that the rate of modern climate change has been unprecedented at least since the late Pliocene, 3.6 million years ago,” study coauthor Benedikt Soja, a professor of space geodesy at ETH Zurich, said in a press statement. “The current rapid rise in day length can thus be attributed primarily to human influences,” according to Soja.

Big ocean-induced drag

Soja and his colleagues refer to this phenomenon as “continental-ocean mass redistribution” in their research, including their latest published Tuesday in the Journal of Geophysical Research: Solid Earth. As melt from polar ice sheets and mountain glaciers pools down into Earth’s oceans, extra water weight builds up in those wider lower latitudes of the globe near the equator, where all this extra mass is more likely to drag on Earth’s spin.

Soja’s coauthor, Mostafa Kiani Shahvandi, likened the phenomena in a press statement to “a figure skater who spins more slowly once they stretch their arms, and more rapidly once they keep their hands close to their body.”

“Only one time—around 2 million years ago—the rate of change in length of day was nearly comparable, but never before or after that has the planetary ‘figure skater’ raised her arms and sea levels so quickly as in 2000 to 2020,” according to Kiani Shahvandi, a postdoctoral researcher with the University of Vienna’s Department of Meteorology and Geophysics.

Read the full story here.