It is less than 24 hours a day!The "mysterious" on the earth accelerates rotation

According to the latest data disclosed recently, on June 29, the earth completed a rotation once by the Earth's 24 hours less than 1.59 milliseconds. This is the fastest time since the atomic clock in the 1960s began to record the earth's rotation.

According to reports, this record has caused the earth to appear "the shortest day in history", and it also shows that the earth has been accelerating in recent years. However, the exact reason for the acceleration of the earth is still a puzzle. In fact, since 2020, the earth has broken the fastest rotation record for more than 20 times, reversing the longer operating cycle that has been last decades.

The picture comes from the photo network

Scientists studying the earth's rotation use the term "Earth's Self -Transfer Day" to indicate the rapid slowness of the earth's rotation, referring to the difference between the time required for the earth to turn around the ground axis and 86400 seconds (that is, 24 hours). When the "Earth changes from changes in the sun" increases, the earth's self -transfer becomes slower. When it decreases and becomes negative, the earth's self -transfer becomes faster.

For a long time, the rotation speed of the earth has been "slowing down", and it usually takes a few milliseconds to complete the rotation once (1 millisecond is equivalent to 0.001 seconds). However, the speed of the earth's rotation is fluctuating, and the time required to complete a rotation will increase or decrease a minute of milliseconds.

Scientists have explained that the earth is not a perfect sphere. Its rotation is always affected by many factors, including internal structures, tidal effects of the moon, and climate change. At this year's "Asia-Oceania Earth Science Society" annual conference, Dr. Leonid Zoref, the University of Moscow, pointed out that the current "changes in the earth's self-transfer of the day" may be related to "Chandler's swing".

"Chandler swing" refers to the small movement of the earth's rotation from the surface of the earth. "The normal amplitude of Chandler's swing is about 3 to 4 meters on the surface of the earth." Dr. Zitov said, "But it disappeared between 2017 and 2020."

Matt Kim, a professor of the University of Tasmania who specializes in Earth Observation, said that there are obviously some things that have changed. "But this change has never been seen since the study of accurate radio astronomy in the 1970s. "

If the day of the earth continues to become shorter, scientists may eventually have to use a "negative leap second" to ensure that the speed of the earth's running around the sun is consistent with the measuring value of the atomic clock. This will be the first "negative leap second" example in history.

It is reported that manual addition and subtraction of one leap second for industries that have higher requirements for time accuracy, such as aerospace, communication, finance, etc., will cause serious losses. And to increase or reduce a leap seconds based on time providing services based on time providing services, it also needs to pay a lot of manpower and material resources.

However, Dr. Zof believes: "70%of the possibilities, the changes in the earth's long -term change have reached the minimum, so we don’t need to negatively."

Source: Red Star News

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