Earth to Experience Shortest Days in July, August 2025, Says Jeddah Astronomy Society
Eng. Majed Abu Zahra, President of the Society, highlighted predictions from the International Earth Rotation and Reference Systems Service (IERS), which indicate that three of the shortest days in modern history will occur on July 9 (1.30 milliseconds shorter), July 22 (1.38 milliseconds shorter), and August 5 (1.51 milliseconds shorter) in 2025. Earth typically completes one full rotation every 24 hours, or 86,400 seconds.
Since 2020, atomic clocks—highly accurate timekeeping devices—have detected subtle reductions in day length. The shortest day recorded so far was June 29, 2022, which was 1.59 milliseconds shorter than the average.
Abu Zahra explained that these measurements are made by comparing data from atomic clocks with various time standards, enabling scientists to monitor tiny fluctuations in Earth's rotational speed. Potential causes for the acceleration include shifts in Earth's liquid core, redistribution of mass due to melting polar ice, rising sea levels, major earthquakes, and gravitational interactions with the Moon.
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