Precise astronomical observations, combined with atomic clocks, have revealed that the length of a day is suddenly getting longer. Scientists don’t know why. This has critical impacts not just on our timekeeping, but also on things like GPS and other precision technologies that govern our modern
Precise measurements show that Earth’s rotation has been mysteriously slowing down since 2020, making the day longer.
Earth’s rotation around its axis has been speeding up over the past few decades. Since this determines how long a day is, this trend has been making our days shorter. In fact, in June 2022However, despite this record, since 2020 that steady speedup has curiously switched to a slowdown. Now, days are getting longer again, and the reason so far remains a mystery.
Just as a ballet dancer spins faster as they bring their arms toward their body – the axis around which they spin – our planet’s spin rate increases when this mass of mantle moves closer to Earth’s axis. This process has been shortening each day by about 0.6 milliseconds each century.
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