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Unusual or Neglected Optical Phenomena in the Landscape

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Abstract

As examples of unusual optical phenomena, some observations of multiple suns and moons are described. They are corroborated by photography; older observations now appear to be genuine. A number of examples are further quoted: shadows, reflections, green flash, halo phenomena, rainbows, iridescent clouds, colors in thin sheets of ice, accidental double refraction. Then some observations are made about physiological optics, relating to contrast and to the perception of flicker and colors.

Of these phenomena, many have not previously been described and several explanations are still controversial.

© 1968 Optical Society of America

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