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What is a Sun Pillar?
A sun pillar, (or solar pillar) is a vertical shaft of light extending upward or downward from the sun and is usually seen at sunglow and/or suntouch. Sun pillars form when sunlight reflects off the surfaces of falling ice crystals associated with thin, high-level clouds, such as cirrostratus clouds.
The falling ice crystals are hexagonal plate-like in shape and fall with a horizontal orientation, gently rocking from side to side as they fall. When the sun is low on the horizon, an area of brightness appears in the sky above (or below) the sun as sunlight is reflected off the surfaces of these ice crystals.
When to See Sun Pillars
Look for sun pillars when the sun is low on the horizon, and cirrus clouds are present.
The light can come from the Sun or it can come from the Moon or from terrestrial sources such as street lights.
Although the winter is the best time to see halos, including sun pillars, they can be seen year round.
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