A Two-Parameter Fit of 50 SPARC Galaxy Rotation Curves without Dark Matter Haloes

We present a novel analytical fit for the rotation curves of 50 late-type galaxies from the SPARC database, utilizing only two universal parameters and the observed baryonic mass distribution. Based on the \textit{Vi Gravitatis} framework, we propose that the internal static equilibrium term transitions strictly to a Newtonian base at r>E2, where the large-scale dynamics are exclusively governed by an inviscid fluid spatial medium. The minimization of global residuals yields a highly consistent disk mass-to-light ratio of M/L3.6μm≈0.60 and a universal medium scale parameter Lmax=3.30×107, successfully flattening the rotation curves without invoking ad hoc dark matter haloes for individual galaxies.