The Earth doesn’t rotate in the same way. Its rotation slows over time, increasing the day by 1.8 milliseconds every 100 years on average. This suggests that a day only lasted 21 hours 600 million years ago.

But scientists discovered something unexpected in 2020. They learned that rather than slowing, the Earth’s rotation has quickened. It currently rotates at a faster rate than it did 50 years ago. Scientists are still unsure what’s causing the increase in Earth’s rotation rate, while some think that it may be related to the twentieth-century melting of icebergs or the large storage of water in northern region reserves.

Is it necessary to be concerned for the time being? Although it will have little impact on our daily lives, it could have significant connections for technology like smartphones, computers, and communication networks. Such problems, though, can be addressed in the end, perhaps by simply deleting rather than adding a jump second. Unless the shortening of the day is driven by human activities, we shouldn’t be concerned.