"A companion star is THE ONE STAR that doesn't undergo Precession..." Walter Cruttenden.
It appears precession is speeding up or slowing down over the Long Day i.e. the 24,000 years of the Processing Day, and that's only fully explained by the BSC or Binary Star Concept and this video points the finger at an Ancient Egyptian star that seems to avoid precession as only a TCS or True Companion Star is able.