Chinese name: Zhang Heng
Nationality: China.
Ethnic group: Han nationality
Place of Birth: Nanyang City, Henan Province
Date of birth: 78 AD
Date of death: A.D. 139.
Occupation: astronomer, mathematician, inventor, poet
Representative works: Lingxian, Seismograph, Four Sorrow Poems.
Zu Chongzhi (429-500) was an outstanding mathematician and scientist in China. People in the Southern and Northern Dynasties, Han people, the word Wen Yuan. Born in Yuanjia for six years, he died in Hou Yongyuan and Qi Hun for two years. His ancestral home is Qiu County, Fanyang County (now Laishui County, Hebei Province). In order to escape the war, Zu Chongzhi's grandfather, Zuchang, moved from Hebei to Jiangnan. Zuchang was once a "great craftsman" in Liu Song, in charge of civil engineering; Zu Chongzhi's father is also a DPRK official. Zu Chongzhi received scientific knowledge from his family since childhood. When I was young, I entered Hualin University and engaged in academic activities. Throughout his life, he served as an official in South Xuzhou (now Zhenjiang City), such as Shi and Fu joining the army, Lou County Order (now northeast Kunshan City), Servant Shooter and Changshui Captain. Its main contributions are in mathematics, astronomical calendar and machinery.
Chinese name: Zu Chongzhi.
Alias: Wen Yuan.
Nationality: Southern and Northern Dynasties in China.
Ethnic group: Han nationality
Birthplace: Qixian County, Fanyang County
Date of birth: six years, Yuanjia, Song Wendi.
Date of death: two years of Qi Huan and Hou Yongyuan.
Occupation: mathematician, scientist
Main achievements: Six decimal places of pi.
Masterpiece: Tell different stories.
A group (673 ~ 727), born in Julu, Hebei Province, whose real name was Zhang Sui, was a famous astronomer and Buddhist in the Tang Dynasty.
A group traveling together
. Born in Xianheng, Tang Gaozong for four years, he died in Kaiyuan, Xuanzong for fifteen years.
His great-grandfather was Zhang, the hero of Emperor Taizong. The Zhang family had declined in the era of Wu Zetian. Zhang Sui studied hard the calendar, Yin and Yang and the Five Elements since he was a child. When he was young, he was famous for his extensive knowledge in Chang 'an. In order to avoid Wu Zetian's wooing, he was named a monk and named Xing. Studied Buddhist classics and astronomical mathematics in Songshan and Tiantai Mountain successively. He translated a variety of Indian Buddhist scriptures and later became the leader of Tantric Buddhism.
After Wu Zetian abdicated in the first year of Loyalty to Shenlong (AD 705), the Li and Tang Dynasties called her back to Beijing many times, but all of them were rejected. It was not until the fifth year of Kaiyuan (7 17 AD) that Li Longji, Emperor Xuanzong of the Tang Dynasty, sent someone to pick him up, and he returned to Chang 'an.
In the ninth year of Kaiyuan (AD 72 1 year), according to Li's Linde Calendar, several solar eclipses failed to be predicted, and Xuanzong ordered one party to preside over the revision of the new calendar. The most important achievement in his life is the compilation of Da Yan Li, and he has also made many contributions in making astronomical instruments, observing astronomical phenomena and presiding over astronomical geodesy.
Guo Shoujing (1231-1316) was an astronomer, mathematician, water conservancy expert and instrument manufacturing expert in China in the Yuan Dynasty. The word Ruosi, Han nationality, is from Xingtai, Shunde (now Xingtai, Hebei). He was born in Yuan Taizong for three years, and Yanyou in Yuan Renzong died for two years. Guo Shoujing used to be the water superintendent, responsible for repairing the canal from Dadu to Tongzhou. 1276, Guo Shoujing revised the new calendar, and after four years, it worked out the chronograph calendar, which has been used for more than 360 years. This was the most advanced calendar in the world at that time. 198 1 year. To commemorate the 750th anniversary of Guo Shoujing's birth, the International Astronomical Society named a crater on the moon after him.