So far, the shortest day ever recorded was July 5, 2024, when Earth rotated 1.66 milliseconds faster than usual. This year, scientists predict three shorter days in July and August. On July 9, the day is expected to be 1.30 milliseconds shorter, followed by an even shorter -1.38 milliseconds on July 22 and a -1.51 milliseconds on Aug. 5.

Scientists anticipate that Earth's rotation will quicken enough to create three shorter days between July and August, starting Wednesday, July 9.