By Scientists say Earth rotation July 9 could bring the shortest day of the year. On Wednesday, July 9, Earth’s spin is expected to speed up enough to shave off about 1.30 milliseconds from the usual 24-hour day.
This isn’t the first time Earth’s spin has fluctuated. The record for the shortest day ever was set on July 5, 2023, with a day shortened by 1.66 milliseconds. These changes are measured as “length of day” deviations from the standard 86,400 seconds.
The cause? The moon’s position relative to Earth. Around earth rotation July 9, the moon will be farther from the equator, altering gravitational forces and speeding up Earth’s spin.
Two more days—July 22 and August 5—are also predicted to be even shorter, with losses of 1.38 ms and 1.51 ms, respectively.
While humans won’t notice the change, atomic clocks will. These ultra-precise instruments, synced to Coordinated Universal Time (UTC), could face slight disruptions. That’s why earth rotation July 9 and similar days matter for systems like GPS, servers, and global timekeeping.
So, while you probably won’t feel it, earth rotation July 9 is a small but fascinating moment in time science.
