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 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.