2025day.year
Earth completes its shortest recorded day due to a slight acceleration in rotation, with July 9 lasting approximately 1.3 to 1.6 milliseconds less than 24 hours.
Earth records its shortest day ever, shortening the day by about 1.3 to 1.6 milliseconds due to a slight increase in rotation speed.
On July 9, 2025, precise measurements by global observatories confirmed that Earth completed its fastest recorded rotation, making the day 1.3 to 1.6 milliseconds shorter than 24 hours. Scientists attribute the slight acceleration to complex interactions between the planet's core, mantle, and oceans, as well as shifting mass distributions such as melting ice caps. While imperceptible to daily life, these minute changes are critical for calibrating atomic clocks and satellite navigation systems. Researchers from the International Earth Rotation Service analyzed very long baseline interferometry and satellite laser ranging data to verify the anomaly. This discovery highlights the dynamic nature of Earth's rotation and prompts refinements in geophysical models and timekeeping standards.
Earth completes its shortest recorded day