Sun pillars occur around sunrise and sunset when there are ice crystals in the air. It makes it look like there is a pillar of light leading from the Sun to the Earth. Do not look directly at the sun.
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- Upper Sun Pillar Contains a description and formation of sun pillars.
- The Weather Doctor - Light Pillars Explains how pillars form, with many diagrams.
- Sun pillars Contains a few pictures.
- Wikimedia Commons: Sun Pillars Contains pictures of sun pillars.
- Atmospheric Optics Contains information on the different types of pillars, and pictures.