徐光启(1562~1633),字子先,号玄扈,明上海县徐家汇人。《明史》本传说他:“雅负经济才,有志用世,及柄用,年已老。”甚为惋惜。他较早在南京接触到西洋传教士利玛窦等,学到很多国外的自然科学,在数理、天文、历算、兵器等方面都取得很好的成就。尤其创先翻译《几何原本》,向国人 Xu Guangqi (1562 ~ 1633), the word first, No. Xuan Hu, Ming Shanghai Xujiahui people. “Ming History” The legend of him: “Ya negative economic talent, aspiring to use the world, and handle with the old age.” Is very sorry. He came to Nanjing as early as the Western missionary Matteo Ricci, learned a lot of natural science abroad, in the mathematical, astronomy, calendar, weapons and other aspects have made good achievements. In particular, the first translation of “geometric original” to the people