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The shortest day on Earth since the 1960s; Why does the earth spin fast? Earth recorded its shortest day since the 1960s, why spin faster and what impact


On June 29, Earth completed a full rotation 1.59 milliseconds earlier than its usual 24 hours, completing a day.

There is a saying that time flies. This seems to be true on recent evidence – indeed, nowadays, tomorrow comes fast – even if it’s a second earlier. On June 29, the Earth completed a full revolution in 1.59 milliseconds in its usual 24 hours. It’s the shortest day on record since the 1960s, when scientists began using precise atomic clocks to measure the Earth’s rotational speed.

This happens more often these days – in recent years the Earth has been spinning a bit faster. On July 26, a full day of Earth’s rotation ended 1.50 milliseconds early. June 29 broke the earth record for the shortest day.

Also, in 2020, while the whole world was thinking about the coronavirus, the Earth recorded its shortest day on record, exceeding 28 days, according to the site timeanddate.com. Among the shortest days recorded in 2020, July 19 was the shortest day, clocking in at 1.47 milliseconds.

A millisecond is a thousandth of a second. From this point of view, a single flash lasts a tenth of a second, or 100 milliseconds. At the 1984 Olympics in Los Angeles, PT. Usha missed the bronze medal by a hundredth of a second. Usha clocked 55.42 seconds in the 400m hurdles. Bronze medalist Christiana Cojocaru of Romania finished in 55.41 seconds. Sweden’s Ann Louise Skoglund finished in 55.43 seconds.

Is the faster Earth a novelty?

Not really. In recent years, while the Earth was rapidly completing its rotation, over the long term, our planet is actually rotating slowly.

Every century the Earth takes a few more milliseconds to complete a cycle – on average the days actually get longer. Thus, 1.4 billion years ago, a day would have ended in less than 19 hours, reported The Guardian citing a scientific article published in 2018. The large trend of slow rotation of the Earth is largely attributed to the gravitational pull of the Moon, which causes tidal friction and slows the Earth’s rotation.

So why are the days getting shorter these days?

Scientists aren’t entirely sure. “It’s definitely different,” University of Tasmania professor Matt King told ABC News. “Something has changed that we haven’t seen since precision radio astronomy began in the 1970s,” he said.

He hypothesized that surface variations induced by climate change could be a factor affecting the way the Earth rotates. These surface variations include the melting of the Greenland and Antarctic ice sheets, and changes in ocean circulation.

“We don’t know the reason for the acceleration of the Earth’s rotation. We only have one hypothesis…” Christian Bizard of the Paris Observatory at the International Astronomical Center told the television channel China’s CGTN.”We believe the reason is in the movement of the Earth’s interior and core,” he said.

Most of the processes that affect Earth’s speed include the motions of the planet’s core, seismic activity, wind speed and the evolution of atmospheric gases, The Guardian reported in a separate article published this week. Actions that push mass toward the center of the Earth will speed up the planet’s rotation, while anything that pushes mass outward will slow the rotation, the paper notes.

Some experts suggest that the tilt in the length of a day may be related to the “Chandler Oscillation,” a phenomenon that represents a slight deviation in the movement of the Earth’s geographic poles. According to Dr. Leonid Soto of the Sternberg Institute of Astronomy at Lomonosov Moscow State University, this oscillation has recently slowed down. This may be due to shorter days. “The normal amplitude of the Chandler Oscillation is about three to four meters above the Earth’s surface. But he disappeared from 2017 to 2020, Dr Zodov told timeanddate.com.

According to NASA, “Earth’s orbit is affected by many factors. Factors include changes in wind patterns or ocean currents. Some of these factors can act to speed up the planet, while others slow it down. “

What would happen if the Earth continued to spin faster?

A system of leap seconds has been used since the 1970s to ensure that clock time matches the rotational speed of the Earth. This includes a one-second adjustment to Coordinated Universal Time (UTC), the time standard used to synchronize clocks around the world. Due to the long deceleration period of the planet’s rotation, 27 leap seconds are added to UTC.

However, if the Earth continues to spin faster and the days get shorter, scientists may first need to introduce the negative leap second, which involves subtracting one second from clocks.

In a blog post published July 25 in Metaengineering, he argued that “while leap seconds are beneficial for scientists and astronomers, they can be challenging for those managing physical infrastructure. “The addition of a leap second in 2012 could have a devastating effect on software that relies on timers or schedulers, as the Reddit website was inaccessible for 30-40 minutes and a negative leap second would not is largely untested.”

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