Challenging assumptions: The 8.5-year rhythm of Earth's inner core
Researchers from China have confirmed the existence of an approximately 8.5-year Inner Core Wobble (ICW) in both polar motion and length-of-day variations, revealing a static tilt of about 0.17 degrees between the Earth's inner core and mantle, challenging...
https://phys.org/news/2023-12-assumptions-year-rhythm-earth-core.html