Earth takes 24 hours to complete a full rotation in a standard day, equal to exactly 86,400 seconds. July 9 was the first of three days in which a millisecond or more could be shaved off the clock on ...

Earth is spinning faster this summer, making the days marginally shorter and attracting the attention of scientists and timekeepers. July 10 was the shortest day of the year so far, lasting 1.36 ...

If today feels like it's flying by, you can blame it on our spinning planet: A group of scientists tracking Earth's rotation predicts that the day will be a fraction of a second shorter than normal.