Abstract

The positions of the neutral points of the skylight are computed for the model of a Rayleigh atmosphere and a smooth water surface that reflects light specularly according to the Fresnel law. The Babinet and Brewster points disappear from the principal plane. They appear within a few degrees below the almucantar near the direction of the sun. The Arago point does not disappear from the principal plane but is shifted closer to the horizon.

© 1968 Optical Society of America

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