Tuesday, July 22, is expected to be the second of three days in 2025 where more than a millisecond could be shaved off the day due to Earth's rotation

Tuesday, July 22 will be the second-shortest day of the year, as Earth completes a full rotation in less time than usual. The planet on Tuesday will experience a shorter rotation than the typical 24 hours, though not by much: 1.34 milliseconds less than usual, according to Timeanddate.com.

Is the Earth spinning faster? Is July 22 the shortest day ever? Here's what to know about the Earth's rotation and why is today the shortest day.