Brewster’s dark patch: a neglected optical phenomenon in the landscape
Published in Weather 74 154-155 in 2019
G.P. Können
Under clear skies and a low Sun, a dark patch appears on a water surface at 90° from the Sun. The phenomenon is a naked-eye manifestation of the polarization of the blue sky. Although this everyday-occurring phenomenon is very conspicuous, it is only since 1980 that it has been discussed in the literature.