Eclipses are scientifically interesting because they allow a rare glimpse of the cooler corona, glowing gases near the sun's surface and solar flares, which are normally not visible because of the brightness of the sun, he said.

The middle of a sun eclipse is seen in Yiwu, a small pastoral county in Hami Prefecture 500 kilometers east of Urumqi, Xinjiang Uygur Autonomous Region,August 1, 2008.

The middle of a sun eclipse is seen in Yiwu, a small pastoral county in Hami Prefecture 500 kilometers east of Urumqi, Xinjiang Uygur Autonomous Region, August 1, 2008.

The middle of a sun eclipse is seen in Yiwu, a small pastoral county in Hami Prefecture 500 kilometers east of Urumqi, Xinjiang Uygur Autonomous Region. Picture taken at 19:58, August 1, 2008

The middle of a sun eclipse is seen in Yiwu, a small pastoral county in Hami Prefecture 500 kilometers east of Urumqi, Xinjiang Uygur Autonomous Region. Picture taken at 20:05, August 1, 2008.

A combination photo shows the different stages of a solar eclipse above the Jiayuguan Fort on the Great Wall of China August 1, 2008

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