Earth’s Accelerating Spin Makes Today Shorter than 24 Hours

Space.com

On Tuesday, Aug. 5, Earth’s solar day will be ever so slightly shorter than usual 24 hours, according to Timeanddate.com, making it not only one of the shortest days of 2025, but also since records began.

At just 1.25 milliseconds under the 86,400-second mark, it won’t be noticeable, but it’s part of a puzzling trend that’s baffling scientists: Earth is spinning faster. After decades of slowing down, our planet’s rotation has been speeding up in recent years — and timekeepers have no definitive explanation. More

32 Comments on Earth’s Accelerating Spin Makes Today Shorter than 24 Hours

  1. You have got to be kidding me…
    How in the hell can you measure the rotation of the earth down to milliseconds?
    What is your reference point? Some object in space that is moving relative to the earth at many miles per millisecond?

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  2. A coupling between the Earth’s weakening magnetic field ‘dynamo’ and it’s rotational kinetic energy? And lets throw in the Sun along with the rapidly changing Galactic current. There. Now I can scratch my head for a long time, like 1.25 milliseconds.

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  3. If we’re spinning faster (=less time) and you’re not standing at the poles, your centrifugal acceleration would be higher so the sum of it and the gravity vector would be less. So you’d be tiny bit lighter. May I suggest the beer fridge?

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  4. Ice accumulation at the South Pole. Several years of successive accumulation and its like a ballerina pulling her arms in to spin faster… Not that they’ll ever admit that to you.

    KR (currently in occupied territory)

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  5. Not that I have seen such a story in years, but the news used to carry, usually on January 1 and July 1, that the atomic clock was adjusted to match earth time. It’s not there was a problem with the atomic clock, but rather that it was a better time keeper than the earth.

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  6. @RadioMattM — Always keep in mind that atomic clocks are digital and the solar system is analog. 😄

    @MJA —
    “What a beautiful blue your nose is, Blue!”
    “Why, thank you Orange. And your argyles are fabulous!”

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  7. Kali Refugee in Texas
    TUESDAY, 5 AUGUST 2025, 18:23 AT 6:23 PM
    “Ice accumulation at the South Pole. Several years of successive accumulation and it’s like a ballerina pulling her arms in to spin faster…”

    You may be on to something. I think a contributing factor is all the “migrants” moving from south and Central America (near the equator) to the U.S. may have done the same thing. Kind of like Guam capsizing if too many Marines get stationed there.

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