About its Greatest Inventor
Zhang Heng, (78 AD - 139 AD), was a native of Shiqiao of Nanyang, Henan Province. He was a
famous man of letters and scientist in the East Han Dynasty in the Chinese history. His
works include Ode to the West Capital, Ode to the East Capital and  22 pieces of other
literary works. He became a court official in 111 AD and was assigned as the court
historian afterwards. He invented the armillary sphere and the seismograph. Guo Moruo (an
outstanding litterateur and scientist in modern China) praised him as "such an
all-around developed figure that was seldom seen in the world history".
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