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

But since 2020, the Earth has repeatedly broken its own record, with the shortest day on record July 5, 2024, when the Earth rotated 1.66 milliseconds faster than usual. In 2025, the shortest day so far has been July 10, when the Earth spun 1.36 milliseconds faster than normal.

July 22 will be the second-shortest day of the year, as Earth completes a full rotation in less time than usual.