郭守敬是我国元代人，也是古今中外有名的一位科学家。他不但精于天文、水利、数学和仪器仪表制造（创制仪器仪表18种），还编著了天文书籍100多卷。700多年前的1292年他主持元大都（今北京）治水工程，开挖通惠河，开创在北京建都以来历代王朝兴建水利的先河。他是我国杰出的 Guo Shou-jing is a member of the Yuan Dynasty in China and is also a famous scientist both at home and abroad. He is not only good at astronomy, water conservancy, mathematics and instrumentation (creating 18 kinds of instruments), also edited more than 100 volumes of astronomy books. He presided over the flood control project of Yuan Dadu (now Beijing) in 1292, more than 700 years ago, and excavated the Tonghui River to create a precedent for water conservancy construction of dynasties in the past dynasties since the founding of Beijing. He is an outstanding person in my country