A halo, an optical illusion that appears around the sun, is seen in the sky in Guiyang, capital city of Southwest China's Guizhou province, May 20, 2011. [Photo/Asianewsphoto]
A halo, an optical illusion that appears around the sun, is seen in the sky in Guiyang, capital city of Southwest China's Guizhou province, May 20, 2011. [Photo/Asianewsphoto]