On January 9, 2021, at 1:00 p.m.
The earth rotates on its own in 24 hours and the sun changes in 365 days. We have known this statement since childhood, but it is definitely not correct. Thus, by 2020, our planet will have driven its axis faster than it did in half a century.
So far, the record for the shortest day has been reached on July 5, 2005. Indicates that the Earth took less than 1.0516 milliseconds to complete its rotation, instead of the usual 86,400 seconds Special site “Time and Date”. During this year of epidemics, British scientists at the National Physical Laboratory cited that the record seemed to be prolonged at the rate of various incarcerations, breaking 28 times par «The Telegraph.
The new record for the shortest day is now July 19, 2020, with the planet orbiting at an average of 1.4602 milliseconds less than one day. Our blue planet does not seem to be in a hurry to slow down: 2021 is a very fast year, with an average day passing 0.05 milliseconds faster than usual. Throughout the year, atomic clocks are expected to accumulate a delay of about 19 milliseconds.
Should we quickly move the clocks one second forward?
The most accurate atomic clocks were developed in the 1950s and 1960s, allowing scientists to detect small variations in the length of days, at the rate of one millisecond. These variations are due to the complex motion of its fluid center, its oceans and atmosphere, as well as other parameters such as the change in waves and Earth-Moon distance or ice levels and erosion. Mountains.
If the rotation of the earth is inconsistent with the ultra-regular rhythm of atomic clocks, a positive or negative flow second can be used to bring the atomic time and astronomical time back into alignment.
Since measurements began a few decades ago, the average rotational speed of the Earth has gradually decreased. Scientists have been forced to add 27 leap seconds to atomic time since the 1970s to keep their clocks synchronous. Last added on New Year’s Eve 2016, clocks around the world were stopped for a second to catch the rotation of the earth.
So this trend is set to be reversed in 2020, and it is only the second time that it may be necessary to quickly remove the world clocks, this is the first time. However, in the long run, the earth will rotate slowly and slowly on its axis.
This breaking, known for a long time, is caused by the moon, which exerts a gravitational force on our planet. Thus, a day on Earth lasted only six to eight hours for our natural satellite to form four billion years ago. In about 200 million years, on the other hand, days can last up to 25 hours.