Simulation of sky polarization degree at Paranal on 26 January 2021, according to the single Rayleigh scattering model (upper left), the MS model (upper right) with L = 0.3 or a neutral point angular distance of 67°, and the Mie scattering model of a single-size particle of radius 0.9 μm (lower left) and a log-normal size distribution (lower right). The polarization degree is color-coded, and the Moon’s position is shown as a white circle.