Scientists believe that each day is shorter than 24 hours owing to the change in the speed of earth’s rotation, which has increased over the last 5 decades.
Scientists Official data revealed that time is passing quicker now than at any point in the last half-century as the Earth’s rotation is faster than normal which makes the length of a day ever-so-slightly shorter than the regulation 24 hours.
The world’s timekeepers are now debating whether to delete a second from time to account for the change, and bring the precise passing of time back into line with the rotation of the Earth. A total of 27 "leap seconds" have been added since the 1970s, in order to keep atomic time in line with solar time.
However, the addition of a so-called "negative leap second" has never been done before. This is because, for decades, the Earth has taken slightly longer than 24 hours to complete a rotation, but since last year it has been taking slightly less.