There is an old saying, "the earth will continue to turn without anyone", which means that no matter what the living things on the earth do, the time of the earth's rotation is always 24 hours, no matter what happens, the speed of the earth's rotation is immobile.
For thousands of years, humans used to schedule a day in 24 hours, but in fact, the Earth's rotation speed in the first eight hours, which means that the time of the day will change 39bet-đua chó-game giải trí -đá gà-đá gà trực tuyến-đánh bài. According to scientists' observation, the Earth's rotation speed is accelerating, which means that the time of the day will become shorter and shorter.
According to The Independent
The Earth's rotation has seen a slight acceleration since 2020. In July 2020, scientists even recorded the shortest month since the 1960s, so 2020 is also the fastest year for the Earth's rotation in nearly 50 years. On July 19 of that year, the time of day was 1.47 milliseconds shorter than 24 hours.
In the coming year, the earth as a whole is still at a higher speed rotation, until this year on July 26, earth rotation and set a new record. You may not have noticed, but it's less than 24 hours a day 1.50 millisecond. Just three days later, that is July 29, the earth again by 0.09 milliseconds broke its record three days ago.
You might think that there are 86,400 seconds in a 24 hour day, and one second equals 1,000 milliseconds. Isn't 1.59 milliseconds the same as no change?
Let alone a loss of 1.59 milliseconds, even a loss of 1.59 seconds would not make a difference in life, would it? It's not as simple as you might think, but what's going on here? Why did the rotation suddenly speed up, and what practical implications does it have for our lives?
Because of the rotation of the Earth, we have the change of day and night, and we can also see the rise and fall of the sun, moon and stars in the east and west.
As early as in ancient times, there is a saying that the sun rises and the sun goes down, so the earth's rotation is closely related to human life, but we often say that the rotation time is not the Earth around its axis of the time it takes. The Earth takes less than 24 hours to complete its 360° rotation, a mere 23 hours, 56 minutes and 04 seconds.
This rotation time, known as sidereal day, is measured as the time it takes a point on Earth to orbit a distant star twice in a row. Because stars are so far away from the solar system that they can basically be considered stationary, they are often used as a reference point.
But we do know that
In addition to its rotation, the Earth also has a revolution, which takes 365 days, or about one degree of revolution every day. If the Earth calculates a day according to sidereal days, although after a day, the Earth is realigned with distant stars, but it is no longer aligned with the sun, which is easy to cause confusion.
To avoid this happening, when we calculate the time of day usually USES the solar day, also is the sun for two consecutive times in transit time, so calculation can consider the effects of the earth to 30 km/SEC, complete a solar day actually need 361 ° rotation cycle, more so than the sidereal day four minutes.
So what's causing the Earth's rotation to speed up?
What are the consequences?
Scientists believe that the sudden acceleration of the Earth is not the result of any one factor alone, but a combination of factors. For example, Chandler wobble: the axis of the Earth's rotation is not fixed, but a small swing of about 9 meters relative to the poles, with a 433 day period.
At such small deviations, velocity changes sometimes occur, and a similar phenomenon occurs when spinning a top. Earthquakes also cause the Earth's rotation to speed up, which breaks a lot of rock. Falling rocks reduce the Earth's moment arm, just like a figure skater spins faster when he pulls his hand back.
The first two are natural causes, so isn't it true that human beings have had no impact on the earth this time?
But no, humans are the biggest driver of the acceleration of Earth's rotation. Due to the large amount of greenhouse gases emitted by human daily life and industrial production, global warming is accelerated, which finally leads to the melting of glaciers at the poles and a large amount of water pouring into the ocean, thus speeding up the rotation speed of the Earth, and the principle is also to reduce the moment arm of the Earth.
The most direct consequence of the acceleration of the Earth's rotation is to affect global positioning systems, such as the United States' GPS and China's Beidou navigation satellite. They are extremely sophisticated systems that require absolutely accurate data for real-time correction. Even the slightest error would cause the satellite to gradually malfunction and become unusable.
Beyond that, the amount of time we spend on our devices in our daily lives is also affected. The time of these systems is defined on the basis of 00:00:00 Coordinated Universal Time on January 1, 1970, which is in sync with the Network Clock Protocol. As the speed of the Earth's rotation changes, time in electronic devices is bound to be affected.
If the Earth's rotation continues to accelerate, scientists will consider introducing a negative leap second, which would artificially take one second off a day and jump straight into the second at 23:59:58, skipping 59 seconds.
However, there is a big risk that a leap second change could cause problems for IT systems, or even cause crashes, affecting technology development.