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On the morning of February 14, 2006,  cirrus clouds swept over Southern California's Anza-Borrego Desert.  When light from the waning gibbous moon passed through the ice crystals making up the clouds, a complete halo formed around the moon.  Because the phenomenon is so large—44 degrees in diameter—and the tree is so tall, five separate wide-angle  images stitched together were needed to capture the scene.