For several years ground It has turned unusually fast, which is why 2020 has included the shortest 28 days since 1960 and 2021 is expected to be the shortest year in decades.
ground On average, it rotates once every 86,400 seconds, which is equal to 24 hours.
However, these twists are not perfect. Before the year 2020 begins, the shortest day since 1973 was July 5, 2005, when the rotation lasted 1.0516 milliseconds less 86,400 seconds.
Why is the Earth spinning faster?
This speed of rotation of the planet varies due to the complex movement of the molten core, oceans and atmosphere.
Scientists monitoring speed Land he provides that the trend of having shorter days will continue in 2021.
According to his calculations, an average day in 2021 will be 0.05 milliseconds less than 86,400 seconds.
Throughout the year, a gap of about 19 milliseconds would have accumulated.
To determine the length of a day, scientists from IRISH They measure the exact speed of the Earth’s rotation, analyzing the exact moments when a fixed star passes a certain location in the sky every day.