Limb darkening as a function of μ compared to the intensity variation generated for the Sun from the ATLAS stellar model (red) and the resulting linear (blue), quadratic (orange), and four parameter (green) limb darkening laws. The model and all three laws generally match the solar limb darkening out to μ = 0.1 at 4001-6301 Å. The linear law is the most different from the data at all wavelengths due to its simplicity.