1、 AD 132.Zhang Heng created the seismograph,the armillary sphere,and the south-pointing chariot (compass).
公元132年张衡创制地动仪、浑天仪和指南车。
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2、 Liang was a palace scholar in Kaiyuan era, Tang Dynasty. He has invented the armillary sphere in cooperation with bonze Yixing. He was both a scholar and an artist.
梁令瓒为唐代开元集贤院学士，曾与僧一行合作设计过浑天仪，是一个学者暨画家。
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