The Earth's rotation is complicated. See https://www.smithsonianmag.com/smart-news/global-warming-changing-how-fast-earth-spins-180957550/ https://www.smithson

The Earth's rotation is complicated. See https://www.smithsonianmag.com/smart-news/global-warming-changing-how-fast-earth-spins-180957550/ https://www.smithsonianmag.com/smart-news/global-warming-cha... for how global warming is theoretically speeding up the Earth's rotation (melting ice causes land to rise at the poles, and moving rock turns out to be more important than water migrating from pole to equator) and https://phys.org/news/2015-12-scientists-reveal-rotation-earth-core.html https://phys.org/news/2015-12-scientists-reveal-rotation-ear... for how interactions of the core, mantle and crust are currently slowing the day down.