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Pillars are vertical shafts of light extenting a few degrees from the
sun. Usually above it. They are normally seen when the sun is low on
the horizon. This pillar of light is in itself uncolored but when the
sun is low and has become yellow, orange or red, the pillar natually
assumes the same color. It is only about 5° high seldom 15°
or more. Pillars are caused by light reflected in slightly inclined
orientated ice-plates |
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