during the Han Dynasty
... that in 132 CE, Zhang Heng, a Chinese court astronomer during the Han Dynasty, produced a seismometer with an inverted pendulum that indicated the direction of earthquakes that occurred hundreds of kilometers away?
... that in 132 CE, <a href="./Zhang_Heng" id="mwGrw" rel="mw:WikiLink" title="Zhang Heng">Zhang Heng</a>, a Chinese court astronomer <b id="mwGr0"><a class="mw-redirect" href="./Science_and_technology_of_the_Han_Dynasty" id="mwGr4" rel="mw:WikiLink" title="Science and technology of the Han Dynasty">during the Han Dynasty</a></b>, produced a <a href="./Seismometer" id="mwGr8" rel="mw:WikiLink" title="Seismometer">seismometer</a> with an <a href="./Inverted_pendulum" id="mwGsA" rel="mw:WikiLink" title="Inverted pendulum">inverted pendulum</a> that indicated the direction of <a href="./Earthquake" id="mwGsE" rel="mw:WikiLink" title="Earthquake">earthquakes</a> that occurred hundreds of kilometers away?