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Earth's rotation is speeding up, making days shorter and raising questions about the future of leap seconds.
Earth is spinning faster, making days slightly shorter by milliseconds.
The shortest day this year was July 10, 1.36 milliseconds under 24 hours.
More short days are predicted.
This affects timekeeping in computers and satellites, which rely on atomic clocks.
Since 1972, 27 leap seconds have been added to UTC to adjust for slower rotation, but Earth's acceleration means these additions are slowing.
Scientists are considering the removal of leap seconds by 2035 and the possibility of a negative leap second if Earth continues to speed up.
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La rotación de la Tierra se está acelerando, haciendo que los días sean más cortos y planteando dudas sobre el futuro de los segundos bisiestos.