After 140 Million Years The Duration Of The Day On Earth Will Be 25 Hours.

After 140 Million Years, The Duration The Of A Day On Earth Will Be 25 Hours! 

-Crazy Facts Of Cosmology. 

The Earth's rotation is gradually slowing. This declaration is happening almost imperceptibly, at approximately 17 milliseconds per hundred years,  although the rate at which it occurs is not perfectly uniform. This has the effect of lengthening our days.

But it happens so slowly that it could be as much as 140 million years before the length of a day will have increased to 25 hours.

The Earth was once believed to the center of the universe.

We could all use an extra hour in a day, but clocks won't need to be extended anytime soon. The time of the Earth takes to make a complete rotation on its axis varies by about a millionth of a second per day,  says physicist Tom O'Brian of the National Institute of Standards and Technology. While some days are shorter than average,  the planet's rotation shows a long term slowing trend, ultimately leading to a longer day.

I heard a scientists say that a day was 21 hours long during the time of the dinosaurs. 

The 24 hour clock is locked into our mammalian biology, our technology and our culture. But it hasn't always been that way. 

The length of the Earth day has been increasing slowly throughout most of the Earth's 4.5 billion year history,  says Dr. Rosemary Mardling,  mathematical scientist at Monash University .