The polarization of sunlight caused by scattering (more specifically, Rayleigh scattering) by molecules in the atmosphere. This polarization reaches a maximum 90° from the Sun. There are three neutral points at which no polarization is present. These are Arago's point, 20° above the antisolar point;Babinet's point, 20° above the Sun; and Brewster's point, 20° below the Sun. See also haidinger's brush.
Subjects: Meteorology and Climatology.