张衡(78年-139年)，字平子，东汉时期天文学家、数学家、发明家、地理学家、文学家。张衡为中国天文学、机械技术、地震学的发展作出了杰出的贡献，发明了浑天仪、地动仪，是东汉中期浑天说的代表人物之一。被后人誉为"木圣" (科圣)。本书是张荫麟撰写的张衡的小传，通过梳理史料，不仅介绍张衡的生平，对张衡所做的科学研究进行了复原和评述。作者论述扎实，文笔简练，对张衡科学成果的研究具有开创性意义。
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