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Curious sunrises-- figures
Ice crystals cause pillars as they drift down like flower petals. The
crystals (blue lines in the drawing) must be aligned almost
horizontally--tipped slightly down. Sunlight grazes the crystal bottoms
and bounces down to the eye. Light seems to come from a vertical shaft
instead of the actual stack of reflections.
Imagine a sun pillar drawn through the stack of ice crystals and you have
the whole picture.
 Credits: Photo-- Lanney Atchley, Drawing--
April Holladay
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