When Ricci, a Jesuit, came to China in the 17th century he got to know Hsu, and the two collaborated to introduce Western scientific knowledge, translating works on geometry, calendars, agriculture and other fields into Chinese.
西元十七世紀，天主教耶穌會傳教士利馬竇來到中國，認識了這位中國歷史上的天文學家，兩人合作引介西方自然科學，將幾何學、曆法、農業等知識，翻譯成中文。