Rotational Brownian motion (astronomy)
In astronomy, rotational Brownian motion is the random walk in orientation of a binary star's orbital plane, induced by gravitational perturbations from passing stars. == Theory == Consider a binary that consists of two massive objects (stars, black holes etc.) and that is embedded in a stellar system containing a large number of stars.
Source: Wikipedia — Rotational Brownian motion (astronomy) (CC BY-SA 4.0)