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flag Earth's rotation is speeding up, making days shorter and raising questions about the future of leap seconds.

flag Earth is spinning faster, making days slightly shorter by milliseconds. flag The shortest day this year was July 10, 1.36 milliseconds under 24 hours. flag More short days are predicted. flag This affects timekeeping in computers and satellites, which rely on atomic clocks. flag Since 1972, 27 leap seconds have been added to UTC to adjust for slower rotation, but Earth's acceleration means these additions are slowing. flag 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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