The fiducial ridgeline of the BHB for Sculptor compared to that of M55 (left) and ω Cen (right). All fiducials are created on the BHB using the same process (see Section 5). The lines are the fiducials for the globular clusters (red) and for Sculptor (orange). The dashed blue line represents the upper limit of the color selection (V − I)₀ < 0.1 mag, over which each cluster BHB is differenced with Sculptor’s to determine a distance. Final distances are derived over this blue selection because the residuals are smaller when compared to a minimization of the full BHB, which is expected given the blue BHB’s predicted weaker sensitivity to metallicity and age effects. The distance modulus to Sculptor derived from M55 is μ ₀ = 19.55 mag and μ ₀ = 19.49 mag for ω Cen.