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Shorter Days, Faster Rotations — What’s Up With Earth?

Team StoryWeavers|February 06, 2021, 06:21 IST| 20

Imagine you’re in an exam hall. It’s been a challenging paper, but you have cracked every question just in the nick of time, except for the last one. “Three mins to go!” the examiner says. “Tie your sheets and write!” 

But you are too engrossed in answering the last question to even listen to the examiner. It’s a five-mark question of the final section, and you are frantically trying to finish answering it. 

Before you know it, the school bell rings, indicating the end of the exam, and the examiner starts collecting the answer sheets! As she approaches your row you realise you’re yet to tie your sheets. So, in a matter of seconds, you quickly string them all together and submit the paper before the examiner can reprimand you. Exam saved!

Image Source: Giphy

Image Source: Giphy

We’ve all been there, haven’t we? In exam halls, matches and quizzes, even a tiny unit of time, like the second, becomes all-powerful. In a matter of just a few seconds things can change in these high-pressure situations, just like tying your answer sheet just in time can save the exam!

However, in the year 2020, the concept of the second gained quite a bit of attention, that too outside high-pressure situations like an exam.  Last year, scientists carefully examined the number of seconds it took for the Earth to complete one rotation on its axis. They studied this with perhaps the same frantic concentration that a student would while watching time run out during an important exam.

Why, though? 

Because after decades of slowing down, the Earth is spinning faster!

What’s up with the Earth?

Based on timekeeping records, the Earth was spinning faster in the year 2020. Usually, it takes the Earth 86,400 seconds to complete one rotation.  However, this is not an exact number and for many years, the Earth in fact has been slowing down. To make up for this time lag, scientists used to add a ‘leap second’ to their clocks to ensure our time is in sync with the Earth’s rotation.

Read Also: Why is February so odd this year?

But, after 50 years of slowing down, the Earth is now spinning faster.

How fast was the Earth in 2020?

The year 2020 had 28 days super short days. In fact these 28 days were the shortest ever recorded in human history. This means that since humans started recording time, the Earth has never spun this fast! Overall, a day on Earth now is half a millisecond shorter than 24 hours.

Image Source: Giphy

Image Source: Giphy

Some scientists estimate that by the time the current year is done, 2021 might be 34 milliseconds shorter than previous years.

Why is the Earth spinning faster? 

There are a lot of things that affect the rotation of the Earth. The molten core inside the planet, the atmosphere and even the Moon — these are some of the things that play a role determining the rate of Earth’s spin. However, one theory suggests that the melting of polar ice caps due to global warming has made our planet rounder thereby making it spin faster.

Image Source: Giphy

Image Source: Giphy

This timelapse shows how many polar ice caps melted in just the year 2016. 

What are the effects of shorter planetary rotation?

Firstly, satellites cannot be adjusted to the shorter rotation of the Earth. This could make GPS systems slightly inaccurate by just a few seconds. A faster rate of spin could also alter our ability to predict celestial events like eclipses. 

A few milliseconds shredded off our daily schedule may not seem like a lot now, but its accumulated effect could be astounding! If your day got shorter, what are some of the things you would rush to do?

See interesting videos on geography and other social sciences in BYJU’S study videos here!

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About the Author

Deepthi is an ambivert who is on a steady diet of good food, filter coffee, and self-improvement. Being an ardent reader, storytelling has been her first love and she enjoys exploring how to convey stories compellingly. Having studied psychology and experienced the learning and development field, Deepthi is driven to understand human behavior and to know what makes each of us unique. You are most likely to find her tucked into a cozy corner at a local cafe with a Kindle or a book in hand. If you find her there, stop by and say hello, she'd be eager to learn your story too. Until then, you can ping her at for anything you may like to share.

Leave a Comment




April 13, 2021

Is the spinning Faster of earth good or bad ??


March 4, 2021

Wow?… I never thought that Earth will spin faster. Thank you Byju’s

Siddharth J Asudhe

February 28, 2021

The year 2020 went really strange Thank you Byjus for this Amazing fact

Aashlesha Chavan

February 28, 2021

I love articles on science, geography and astronomy.
The information byju’s has provided us ( Students) is very interesting and quite important too.
I would love to read more and more blogs like these.
Thanks byju’s blogs and plz keep providing such interesting blogs?

Priyanka agarwal

February 27, 2021


Osho Aryan

February 27, 2021

This is insane….?
Unbelievable,Earth can even speed up and slowed down in its constant occuring period…
That’s why I love Science and I feel Science ✈️????❤️??

Ambedkar Gaddala

February 26, 2021

I didn’t understood clearly my request to BYJUS to do video on this interesting topic so that it will help me understand better
Thank you BYJUS

Saniya Kotnal

February 26, 2021

It is too much interesting that the earth is spinning faster !!
I love to learn about interesting facts.
Thank you BYJU’s for this wonderful information.?


February 26, 2021


Hir Patel

February 26, 2021

I always loves to read articles on space, earth, and galaxy
While reading I was wondering that even 1 milliseconds could value……..
And Really, 2020 has been strange.. ??


February 25, 2021

Great information..?

M. Sai Dhakshana

February 25, 2021

Interesting to learn science facts.
I thank for you for these information. I love Byjus


February 25, 2021

Wonder! Byjus is amazing and i know more and how to learn in this app and i also fun and fall with love of learning and this chapter Why Earth Is spinning faster thats i know many more of the earth ,
Thank you


February 25, 2021

What if social network
Disappear for Only one Day

Vedant Chaubey

February 25, 2021

What a unbelievable idea of Earth provide by Byju’s.
These ideas help me very high.
Thanks Byju’s

Keshika Raj

February 23, 2021

Byju’s blogs are awesome and very informative. ??


February 17, 2021

Really wow!


February 6, 2021

Wow ??
Never even though about it that one milliseconds could value so much …..


February 6, 2021

??? couldn’t think that Earth can even speed up
Really, 2020 has been strange (to say the least)!
And even though we have entered 2021, still past events are going on in our minds?

Alokendra Mandal

February 6, 2021

Wow! What a new fact you have provided, we never think of this. That’s why Byju’s newsletter is one of the best newsletters I have ever seen.


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