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China - A Great Country …igures in Chinese History
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China - A Great Country in the East 2: Eminent Figures in Chinese History.iso
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2003-01-14
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At the Jianguomen Ancient Observatory in Beijing is installed a simulated armillary sphere, an astronomical model with solid rings,
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all circles of a single sphere used to display relationships among the principal celestial bodies. This is one of the two greatest inventions
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of Zhang Heng, the great astronomer of the Eastern Han Dynasty, the other being the seismograph, a remarkable instrument which
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indicated the region of an earthquake.