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时间:2020-06-04
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1、ZhangHengZhangHeng(张衡)(78AD—139AD)wasanastronomer,mathematician,artistandliteraryscholar(文学学者)intheEasternHanDynastyofChina.Bornintoday’sNangyangCounty,Henan,hewasagoodwriteratage12.Attheageof16,helefthometopursue(从事)hisstudyingthecapitalcity.Hespentatleast10years
2、ofhisyouthinliterarystudiesandwriting.Hepublishedseveralwell-recognizedliterarywritings.Heswitchedto(转向)astronomyafterage30.Intheyear123hecorrectedthecalendartobringitintolinewiththeseasons.In132ZhangHenginventedthefirstseismograph(地震仪)formeasuringearthquakes.Hisd
3、evicewasintheshapeofacylinder(圆柱体)witheightdragonheadsaroundthetop,eachwithaballinitsmouth.Aroundthebottomwereeightfrogs,eachdirectlyunderadragonhead.Whenanearthquakeoccurred,aballfelloutofthedragon’smouthintoafrog’smouth,makinganoise.Healsoinventedtheodometer(里程表
4、).ZhangHengwasthefirstpersoninChinatoconstructarotatingcelestialglobe.Inoneofhispublicationshealsoproposedπ=730/232(orabout3.1466).1
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