Earth’s days are getting longer: Astronomical measurements and atomic clocks have revealed a major change taking place on Earth. The length of days on Earth has suddenly started getting longer and it is surprising that even scientists do not know why this is happening. Let us tell you that this change happening on Earth will not only affect our timekeeping but will also affect GPS and other technologies that control our lives. Know that over the past few decades, Earth’s rotation around its axis—which determines how long a day is—has been accelerating. This change is shortening our days. We broke the previous record for the shortest day in the previous 50 years in June 2022. But despite this, that increased pace is slowly slowing down from the year 2020 – the days are getting longer once again. The cause of this, however, is still unknown. Let us know what scientists have to say about this incident.
According to a report published in ‘The Conversation’, scientists Matt King and Christopher Watson of the University of Tasmania said, our mobile phone clock shows that there are 24 hours in 1 day, but it takes the Earth to complete 1 revolution on its axis. it takes time. , The time taken is sometimes a little different than this. These changes occur almost instantly over a period of millions of years. Earthquakes and hurricanes can also play a role in this. It has been found that it is very rare to get the magic figure of 86,400 seconds in a day. The ever-changing planet Earth For millions of years, the Earth’s rotation has been slowing down due to frictional effects associated with the tidal movements that propel the Moon. This process adds about 2.3 milliseconds each century to the length of each day. Know that a few billion years ago the day on Earth was only 19 hours. Although another process has been working in the opposite direction for the past 20,000 years,
According to scientists, when the last ice age ended, the melting of the polar ice sheets reduced the pressure on the Earth’s surface and the Earth’s mantle began to accelerate towards its two poles. It’s just like a ballet dancer brings her arms towards her body, then spins very quickly. As this mass moves closer to the Earth’s axis, the speed of our planet’s rotation increases. Every century, this process decreases by about 0.6 milliseconds per day. Know that for decades and a long time, the relationship between the Earth’s interior and the surface has also been trending. In addition, large earthquakes can also change the length of the day, however, this happens in very small amounts. In addition to the large-scale changes, weather and climate in a short period of time also have a significant effect on the rotation of the Earth on its axis, which shows variation in both directions. The fortnightly and monthly tidal cycles revolve extensively around the planet, allowing the length of the day to vary by milliseconds in either direction. We can see tides every day in the record for periods of up to 18.6 years. The speed of our atmosphere also has a profound effect. Apart from this, ocean currents also play a major role. At the same time, seasonal snow and rain change things further.
Why Earth is suddenly slowing down: Since the 1960s, when operators of radio telescopes around Earth began developing techniques to simultaneously observe cosmic objects like quasars, we’ve had a great deal of Earth’s rotation rate. The deal is on. It was an accurate guess. Then a comparison between these estimates and an atomic clock showed that the length of the day has been decreasing over the years. But once we remove the fluctuations in rotation speed, there is a surprising revelation that we know is caused by tidal and seasonal effects. Let us tell you that despite reaching its shortest day on Earth on June 29, 2022, the length of the days has been increasing since then. This change in the last 50 years is unprecedented. The reason for this change in the length of Earth’s days is unclear.
Significantly, this may be due to changes in weather systems with back-to-back La Nia events, although these have happened before. Scientists have estimated that the mysterious change in Earth’s rotation speed is related to the ‘Chandler wobble’ phenomenon, a small deviation in Earth’s rotation axis with a period of about 430 days. Analysis from radio telescopes also shows that aberrations have decreased in recent years; Both can be combined. A final possibility is that nothing specific has changed on or around Earth. It may be long-term tidal effects acting in parallel with other periodic processes to produce temporary changes in the Earth’s rotation rate.
Significantly, it is important to correctly understand the Earth’s rotation rate for many applications. Without it, navigation systems like GPS would not work. Also, after a few years, timekeepers add leap seconds to our official timescale to make sure they’re not going out of sync with Earth. If the Earth moves over even more days, we may need to include ‘negative leap seconds. This would be unprecedented and could destroy the Internet. However, the need for negative leap seconds is currently considered impossible.
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