Solar Barycentric Motion as Space-Phase Feedback in the SP3 Framework

The Sun is commonly described as executing a reflex motion about the solar-systembarycenter due to gravitational forces exerted by orbiting planets, particularly the gasgiants. In this paper, solar barycentric motion is reinterpreted within the SP3 framework asa dynamic feedback phenomenon mediated by space-phase. The Sun is embedded within acomposite, memory-bearing space-phase shaped primarily by the Sun itself and by Jupiter,Saturn, and the other massive planets. As the gas giants move through their orbits, theycontinuously condition, stiffen, and relax this shared space-phase, generating time-lagged,asymmetric reactions that feed back onto the Sun. The resulting barycentric motion is not apassive gravitational reflex but an active consequence of mutual space-phase coupling,hysteresis, and delayed relaxation. This work extends the perpetual-surfer mechanismpreviously applied to planetary orbits, here applied to the motion of the central star itself.