Physical Reconstruction of a Privileged Cosmological Synchronization: CMB Dipole Anisotropy as Cosmological Ground

The Michelson--Morley experiment of 1887 refuted the mechanical model of the aether, yet was interpreted as closing the entire class of questions about a preferred medium and absolute rest. The present paper shows that this interpretation is redundant relative to the data. The dipole anisotropy of the cosmic microwave background (CMB), reliably measured in 1977, establishes a physically preferred reference frame the CMB rest frame thereby making possible the physical reconstruction of a privileged global synchronization. This does not contradict special or general relativity: both theories correctly describe local physics within a medium that is homogeneous at laboratory scales. An extended thought experiment with six spatial directions shows that the CMB Doppler shift allows any observer to precisely recover the vector of their motion relative to the CMB rest frame and the global simultaneity of events. Within the Metamonist corpus, the medium is identified as the actualization field F1234, of which the cosmic microwave background is the thermodynamic signature. The ontological interpretation of SR and GR requires clarification: both theories describe correct local kinematics of observers but do not exhaust the global structure of spacetime.