The displacement of the angle of intersection of the relative total luminance indicatrices with one another as well as with the spherical and Rayleigh luminance functions is studied with the help of model calculations of the luminance indicatrices of the daytime sky in the UV-region of the spectrum. The contribution of each term of the luminance indicatrix (aerosol, Rayleigh, and multiple scattering) to the drift of these intersection angles is determined. It is shown that in the UV-part of the spectrum multiple-scattering effects can cause the angles of intersection of the indicatrices to follow a loop-shaped trajectory.
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