BEIJING, May 20 (Xinhuanet) -- Residents in Changsha, Capital of central China's Hunan Province have enjoyed the golden opportunity to see an atmospheric wonder: a solar halo. Yesterday, the sun was wrapped by a grey and black band and the sight looked more beautiful as colorful rings appeared outside the ring. The spectacular sight lasted three and half hours in the city. Meteorological experts make it clear the solar halo can not foretell good or ill luck since it is only an atmospheric phenomenon. Solar halos indicate the increase of steam and the coming of low pressure. (CRIENGLISH.com)