Recent changes in the speed at which the Earth rotates may result in the need for a negative leap second. One expert explains what this is, and how it impacts timekeeping on Earth.
, particularly in the northern Atlantic Ocean, as having an impact as well.
While the Earth’s rotation has since slowed down, 2021 is still predicted to be the shortest year in a decade by milliseconds, says Hyde. This may create a need for a negative leap second. “This clock does not depend on any external force to give you that count of time, it’s a completely independent measurement,” said Hyde. “Atomic clocks are incredibly accurate at keeping time.”
According to the NIST, leap seconds have been added once every 18 months or so since 1972, making them quite common. Negative leap seconds, on the other hand, haveWhile the Earth’s spin has slowed down since last year, it’s still spinning slightly faster than average.the average length of a day in the first half of 2021 was 0.39 milliseconds less than it was the year before. From July to September though, days were actually 0.05 milliseconds longer than the 2020 average.
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