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Glitter Paths

Rippled surfaces like water produce glitter paths consisting of myriads of idividual glints reflected by the waves. The shape of the glitter path depends both on the elevation of the light source above the horizon and the inclination of the waves. When the sun is near the zenith, the reflection pattern is circular. With decreasing elevation, the shape is elongated and turns elliptical. With low sun, the glitter path turns into a column. Close above the horizon, the sun can no longer produce a glitter path - the waves shadow themselves.. The lower the sun, the narrower the glitter path.

The column of reflected light on a water surface is not always strictly vertical. If the wavelets are moving in a predominating direction, the glitter path will shift to the same direction. This happens because the waves slopes are not uniformly distributed. Wave formation is no longer irregular if the wind is blowing across the surface. On still water surfaces, the images of the sun or the moon are undistorted. They occur at the same angle below the shore line as the light source lies above it. Glitter paths are nothing but the distorted reflections of a solar or lunar image.

The same effect occurs on other uneven surfaces, for example on a floor with tiny scratches (see Scratches on Glass ). Ice crystals floating in the air produce columnar halos.



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