Zhang Heng invented the first seismograph and also remade the calender so that the seasons were aligned.
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the role of Zhang Heng in advances are that he made the seismograph, was a respected astronomer, mathematician, engineer and painter during the Eastern Han rates
when zhang heng who seismograph invented it now people now when a earthquakes
Zhang Zhongjing was born in 150.
Zhang Taofang died on 2007-04-29.
Zhang Qinlin was born in 1888.