Earth has clocked its shortest day since scientists began using atomic clocks to measure its rotational speed. On July 29, 2022, Earth completed one spin in 1.59 milliseconds less than 24 hours. This is the latest in a series of speed records for Earth since 2020.
In general, Earth’s spin is slowing down, although only ever-so-gradually. That’s why we occasionally have to add a leap second to our calendars. The last leap second added was on December 31, 2016. But over the last few years, Earth’s spin is slightly faster. Why???
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