For several years Land It has been spinning at an unusual speed, which is why 2020 has included the shortest 28 days since 1960, and 2021 is expected to be the shortest year in decades.
The Land On average, it rotates once every 86,400 seconds, equivalent to 24 hours.
But these twists aren’t exactly perfect. Before the start of 2020, it was the shortest day since then It was 1973 on July 5, 2005 When the spin took less than 1.0516 ms 86,400 seconds.
Why is the Earth spinning faster?
The planet’s rotation speed varies due to the complex movement of the molten core, oceans and atmosphere.
Scientists who monitor speed They guarantee the land The trend of having shorter days will continue into 2021.
According to his calculations, the average day in 2021 would be 0.05 milliseconds less than 86,400 seconds.
Over the course of the year, a delay of about 19 ms will accumulate.
To determine the length of the day, scientists from Irish They measure the exact speed of the Earth’s rotation by looking at the exact times a fixed star passes through a specific location in the sky each day.