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Earth’s rotation accelerates to break record for shortest days since the invention of atomic clocks

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If you think the days are getting shorter, it’s probably not an illusion. Scientists found that on June 29 this year, the Earth’s rotation speed accelerated by 1.59 milliseconds, which is also the shortest day on Earth since the atomic clock can accurately measure time.


CNN reported on the 8th that the Earth’s rotation on June 29 was faster than the normal 24 hours, according to data from the International Earth Rotation and Reference Systems Service (IERS), a global time organization. 1.59 milliseconds (1.59 thousandths of a second) and faster.

Generally speaking, the time required for the Earth to rotate once on its axis is one day, which is approximately 86,400 seconds.

Prior to this, the shortest day on record was July 19, 2020, which was 1.47 milliseconds below normal.

US Naval ObservatoryretireDennis McCarthy, head of the timekeeping department, said the atomic clock is the most accurate standardized time measurement tool known to man and has been used to measure and measure Earth’s rotation since the 1950s.

He said that although June 29 was the shortest day in modern history, research published in the scientific journal “Paleocianography and Paleoclimatology” in 2020 showed that the era in which dinosaurs dominated Earth 70 million years ago, the length of a day was only is 23.5. hours.

McCarthy said that according to National Aviation andspaceNASA scientists have found that the Earth’s rotation has slowed since 1820, but in the last few years the speed of the Earth’s rotation has started accelerating again.

McCarthy said that there is no definite answer as to how or why the Earth’s rotation speed is slightly faster, but it could beglacierThe result of glacial isotopic adjustment, or the result of land changes due to the melting of glaciers.

He said that the Earth is slightly wider than its height, and therefore a flattened sphere, and that polar glaciers can exert pressure on the crust at the North and South poles.

McCarthy analyzed that due to the melting of glaciers at the poles due to the climate crisis, the pressure on the Earth’s top and bottom decreases, which will cause the crust to expand upward, making the Earth more round and round. The planet will spin faster.



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