你知道月球上有一座環形山稱為「張衡山」嗎？你知道太陽系中有一顆編號1802號的小行星名為「張衡星」嗎？這是世人為了表示對張衡在天文方面卓越貢獻的崇敬，讓他與日月星辰同在。
這位世界級的天文巨星不僅是天文學家，也是發明家。他發明了世界上第一架測定地震及方位的「候風地動儀」，以及世界上第一臺用水力推動的大型觀察星象的「渾天儀」。這些發明可說是獨步全球，比起歐洲相似的發明早了一千多年呢！
此外，他在數學、地理學、文學方面也卓然有成，他，還是個畫畫高手呢！現在就讓我們翻開書，一同經歷這位「天文巨星」豐富璀璨的一生！
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