Earth set a new record for the shortest day on June 29.completing a spin about 1.59 milliseconds faster in 24 hours. This appears to be the fastest spin on record since the 1960s, when scientists began using atomic clocks to track our planet’s rotation rate.
It is known that the spin of the Earth is slowing down, this can be noticed especially if we observe for longer periods. Approximately every century, our planet takes a couple of milliseconds longer to complete one rotation. Scientists speculate that it could be due to certain processes in the inner or outer layers of the core, the oceans, the tides, or even climate change.
However, the new data collected suggests that it actually fluctuates within a general pattern and therefore our planet can sometimes complete a rotation a little faster than normal, by a fraction of a millisecond. In 2020, the Earth also seemed to be speeding up, completing its daily rotations faster than normal on 28 occasions, with the fastest one taking 1.47 milliseconds less than normal.
While it is not clear what causes this trend, Leonid Zotov, along with his colleagues Christian Bizouard and Nikolai Sidorenkov, suggest that it may have something to do with the so-called Chandler Wobble. This is a slight deviation from the axis of rotation of our planet.
“The normal amplitude of the Chandler Wobble is about three or four meters on the Earth’s surface, but from 2017 to 2020 it disappeared,” explains Zotov quoted by the Time and Date medium.
The scientists are expected to make their case August 1-5 at the next annual meeting of the Asia-Pacific Society for Geosciences.
Here the note in Sputnik