https://www.live-feeds.com/feed/canadian-study-says-earth-s-core-is-quietly-changing-the-length-of-a-dayContinuously updated, source-cited coverage. https://www.live-feeds.com/feed/canadian-study-says-earth-s-core-is-quietly-changing-the-length-of-a-dayhttps://www.live-feeds.com/feed/canadian-study-says-earth-s-core-is-quietly-changing-the-length-of-a-day#u93903Fri, 02 Oct 2026 00:22:18 +0000A Canadian study suggests that Earth's core is subtly changing the length of a day by a few milliseconds over decades. This variation is caused by a gravitational tug between the slightly misshapen solid inner core and density variations in the mantle. The changes are hard to detect and have implications for navigation and global timekeeping.Why it mattersScientists have long known that Earth's rotation is not perfectly uniform, but the middle-range shifts that unfold over several decades have been harder to explain. Understanding these changes can help improve the accuracy of global