(top) A clear sky region at sunset and its mirror image on the water surface an observer sees when looking perpendicular to the solar meridian, southward (left) and northward (right). The dark areas on the water surface are the Brewster's dark patches. (bottom) As the top four pictures for a partly cloudy sky at 26 degrees solar elevation angle. The dark area in the bottom right picture is the Brewster's dark patch. For details, see pp. 8353–8361.