Daily Almanac for
Nov 30, 2009
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moon' pil"lar



Astron.
a halo phenomenon in which a vertical streak of light appears above and below the moon, believed to be caused by the reflection of moonlight by ice crystals with vertical axes. Cf. sun pillar.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

moonlitmoonprobe
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