Connecting the Hubble Parameter to the Cosmic Microwave Background Dipole via Horizon Thermodynamics and Solar System Motion

We show that the Haug--Tatum thermodynamic RH=ct framework, combined with the Haug--Spavieri (HS) geometric proposal and the motion of the Solar System relative to the cosmic microwave background (CMB), supplies a compact prediction for the absolute CMB temperature and its kinematic anisotropy. The proposed horizon-temperature relation fixes \( T_{CMB,0}=T_P\sqrt{2t_PH_0}/(8\pi) \) from an independently specified Hubble parameter, without first inserting the measured CMB monopole temperature. It thereby determines the associated blackbody spectrum, Wien peaks, mean photon energy, photon number density, and radiation energy density. When an independently inferred observer velocity is supplied, the same normalization predicts the dipole amplitude, angular temperature profile, and kinematic quadrupole. We express the observer dependence covariantly using the CMB radiation four-velocity and present illustrative comparisons with the Planck dipole, the independent Planck aberration/modulation constraint, and the historical muon-flux velocity estimate. A candidate dynamical HS line element permits explicit analysis of radial null propagation and the character of its evolving horizon surface. The principal result is a falsifiable H0 → T0 → ΔT(θ) chain with one background input and an external velocity vector, providing an observational distinction from cosmological treatments that specify the present CMB temperature separately. The published velocity constraints and figures are used as consistency comparisons; no new pixel-level CMB fit is claimed.