Yes,The earth suddenly started spinning faster。
According to TimeAndDate.com, the Earth rotated 1.59 milliseconds in less than 24 hours on June 29, 2022 UTC. It is the shortest ever recorded by scientists.
This goes against the long-term trend of a gradual slowdown in the Earth’s rotation caused by tides, magma flows, melting ice caps and other factors that introduce friction.
The speed of Earth’s rotation is measured relative to the length of the day specified by atomic clocks. That isDelta-TA numerical value called (delta T), which represents the difference between the theoretical value of the Earth’s rotation in one day (24 hours) and the actually measured value (Reference:Materials of the National Astronomical Observatory）。
But atomic clocks cannot be used to measure the speed of rotation of the ancient Earth. To calculate this, we need historical records of solar eclipses.
Recently published in the Journal of the Pacific Astronomical SocietyPublished paperit is the result of a study of Byzantine literature. Researchers were looking for official records of solar eclipses in the eastern Mediterranean between the 4th and 7th centuries, when few detailed eclipse records were found.
One of the authors, Associate Professor Koji Murata of Tsukuba University, said, “Most of the direct eyewitness evidence from this era has been lost, but the quotations and translations recorded by people in later generations provide valuable information.” . WhenHe says. “In addition to reliable information on the position and time, we needed confirmation of the entirety of the eclipse.”
“Total state” refers to the state in which the moon completely blocks the sun in the event of a solar eclipse. It won’t really be dark, but there will be a twilight state where you can see bright stars and planets and even see the corona shining around the Sun.
The next total solar eclipse is expected to be observed in Western Australia, East Timor and West Papua on April 20, 2023.
The researchers found details on when and where five total solar eclipses may have occurred in the years 346, 418, 484, 601 and 693 AD.
At that time, they needed to get information on “Delta-T”. This is an important piece of information for calculating where the whole on Earth passes. If this number is different, the crossing point of the state of wholeness will shift significantly east or west. The changes in Delta-T tell us the duration of a day on Earth.
A new total solar eclipse discovered by researchers this time occurred on July 19, 418 AD. Ancient texts said stars could be seen in the daytime sky from Constantinople (now Istanbul). This information was very important, as Delta-T values were previously thought to have placed Constantinople outside the total solar belt. Therefore, the Delta-T value in the 5th century must have been different than previously thought, allowing scientists to better record changes in the Earth’s rotational speed throughout history.
“Our results show that the 5th century Delta-T should be revised upwards and the 6th and 7th century Delta-T should be revised downwards,” Murata said.
