“the total solar eclipse is one kind of very unusual phenomenon, in that several minutes, the sky brightness will drop 1,000,000 times suddenly, the temperature can fall suddenly suddenly. moreover the total solar eclipse time is longer, the temperature drop is more obvious.”on may 31, academician, renowned astrophysicist fang cheng in the report said in “wonderful and the grand total solar eclipse”, on july 22 9:30 am our country yangtze valley occurs the total solar eclipse time will be 5 to 6 minutes, at the appointed time estimated the local temperature will drop 15℃ to 20℃. it is reported that previous time appeared in the yangtze valley total solar eclipse occurs in 1575, 434 years once more will welcome from now on only then the total solar eclipse, but the next time must wait till in 2309 only then to be possible to see. fang cheng said that the total solar eclipse occurs when the sky brightness will drop 1,000,000 times sud