On July 22, 2009, a total solar eclipse described as "the most perfect in this century" will take place in the Yangtze River basin of our country. The duration of totality can last up to about 6 minutes. More importantly, the areas covered by the path of totality are among the most densely populated regions in China, and the number of people who will directly witness the total solar eclipse may reach an unprecedented level in history. Qinghai, Tibet, Sichuan, Yunnan, Chongqing, Hubei, Hunan, Jiangxi...