
A light pillar is a visual phenomenon created by the reflection of light from ice crystals with near horizontal parallel planar surfaces. They are most commonly seen as sun pillars; however, moonlight and strong artificial light such as street lamps can also form light pillars. The pillar appears as a feather of light that extends vertically above and/or below the light source. Most sun pillars are seen when the sun is low on the horizon (generally no more than 6 degrees above) or just below it.
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Wednesday, August 26, 2009 6:17 PM