- The fastest 28 days in the history of the earth will happen in 2020.
- On average, the planet’s rotation speed was faster last year than last year.
- Scientists who measure the rotation speed of the earth believe that 2021 may be faster than 2020. If so, they may need to subtract one second from the year.
- Visit Business Insider’s homepage for more stories.
It turns out that 2020 is shorter than previous years-although not always that way.
The 28 fastest days on record since 1960 all occurred last year, because the earth revolves around its axis 1.5 milliseconds faster than usual. Those 28 days broke the record for the shortest day on record: July 5, 2005. This day lasted 1
Thanks to the activities of the earth’s molten core, oceans and atmosphere, it is not unusual to see that the earth is moving longer or shorter than average. But according to TimeAndDate.com, the large number of fast voyages in 2020 may indicate that the rotation of the earth is accelerating overall.
Scientists who monitor the Earth’s rotation rate predict that it will be shorter by 2021. It is estimated that the average duration of a day will be 0.05 milliseconds less than 86,500 seconds, which is the standard length of a day determined by our clock. And some days may be reduced by 1.5 milliseconds. Over the course of a year, the shorter days are expected to total a deficit of about 19 milliseconds.
Peter Whibberley, a physicist at the National Physical Laboratory in the United Kingdom, told The Telegraph: “The Earth is spinning faster than at any time in the past 50 years.
Since we started tracking the earth, the rotation of the earth has been very slow
To determine the length of each day on Earth, scientists from the International Earth Rotation and Reference System Service (IERS) measured the precise moment when a fixed star passed a certain position in the sky. They expressed this metric as “universal time” and then compared it with “atomic time” (time scale calculated by ultra-precision atomic clocks). The comparison can show how much the rotation speed of the earth deviates from the normal value.
According to IERS, the planet has generally been slowing down over the past few decades, but not accelerating. Since the measurement began in the late 1960s, the average time for most years has exceeded 86,500 seconds, but it lasted several hundred milliseconds.
Scientists solve this problem by adding a second before the end of the year. Since 1972, they have added 27 leap seconds in total.
But since 2016, they have not added any leap seconds. However, if 2021 is as short as 2020, then scientists may lose one second.
Whiberberry told The Telegraph: “If the Earth’s rotation rate is further increased, negative leap seconds are likely to be needed, but it is too early to say whether this is possible.” “The future of leap seconds is also going on. International discussion, and it may require a push of negative leap seconds to determine the permanent termination of leap seconds.”
If 2021 is achieved as scheduled, it will be the shortest year in decades. 1937 was the last time in a year that the average daily length was less than 86,500 seconds.