V.R370 — H_0 Tension as Galactic Scale Effect

The H_0 tension (local 73 vs CMB 67.4 km/s/Mpc, 6.8 sigma) propagates directly into a_0 = c*H_0*iota_tau/2. Rotation curve galaxies are at low redshift (z<0.1) where local H_0 applies. This structural connection makes the H_0 tension traceable to galactic dynamics: as the tension resolves, the BTFR normalization A must shift accordingly.