Li Yexing (483-549), the eldest son of Shangdang during the Southern and Northern Dynasties. Northern Wei, Eastern Wei famous scholars.
Li Yexing's grandfather Li Qiu and his father Li Xuanji are both known as filial and honest. Influenced by family education, Li Yexing has been honest and studious since childhood. He worked tirelessly, once cared for books and sought a teacher. He first worked in the school between Zhao and Wei (now Hebei) under the school of Xu Zunming, and then went to Yuyang, and visited Xian Yu Lingfu to study with him. Xian Yu Lingfu has an arrogant attitude and belittles Xu Zunming as "Doctor Qiang". Once, Xian Yu Lingfu explained "Zuo Zhuan", and Li Yexing asked him several important things, but was asked. Li Yexing then left and returned to Xu Zunming's school. As a result, all the students who were originally taught by Xianyu Lingfu went to Xu Zunming to study. Since then, Xu's apprentices have become famous.
Li Yexing is knowledgeable, reads ancient and modern books, and is good at writing essays and sentences. He is proficient in all kinds of schools, maps, latitudes, wind angles, astronomy, and divination, and is especially good at astronomy and calendar calculation. Before he became an official, although Li Yexing lived a hard life, he was able to be content with poverty and enjoy the way. He often encouraged himself by his creed and creed to be rich and noble, poor and humble, and mighty and mighty, and mighty and mighty. Therefore, he was a pride and would not be surrendered to others. If he was not treated well enough, even if he was a powerful family, he would not be surrendered to him. Later, Li Yexing defected to Wang Zunye as his disciple and was elected as a filial and honest person, and was appointed as a proofreader. He lived through two dynasties in the Northern Wei and Eastern Wei. During the Northern Wei Dynasty, he served as the book Zuolang and Tongzhi Sanqi Secretariat, as well as the General Ningshuo, General Zhenglu, and Zhongsan Dafu; Sanqi Secretariat; General Pingdong, Guanglu, and General Anxi; General Zhongjun, General Tongzhi Sanqi; Person. He successively granted the eldest son Bo and the founding of Tunliu County, with a fief of 500 households.
After the Northern Wei Dynasty split , Emperor Xiaojing ascended the throne in Yecheng (now Linzhangxi, Hebei), known in history as the Eastern Wei Dynasty. Due to the wars over the years, Yecheng was almost ruined at that time. After the establishment of the Eastern Wei Dynasty, everything was in trouble. Xin Shu, the doctor of the starting department, recommended Li Yexing to "record the patterns, examine the right and wrong, compare the past and the present, and make the right and wrong." Therefore, Li Yexing was appointed as General of Zhennan and Supervisor, and together with Shangshu Youpushe and Gao Long, the master of the construction craftsman, "repairing the musical instruments, clothes and hundreds of operas of the Three Offices." In the fourth year of Tianping in the Eastern Wei Dynasty (537), he and the Changshi of the Sanqi Changshi Li Xie, the Lang of the Ministry of Personnel, Lu Yuanming, and others went to the Southern Liang . He and the Changshi of the Liang sanqi Zhu Yi, and the Emperor Wu of Liang Xiao Yan, and others were in a mess of their mission. He returned to the army and served as the General of the Sanqi cavalry, and formulated the five rituals of , Gaolong's , etc.
Li Yexing's life has made great contributions to astronomical calendar . During the Northern Wei Dynasty, the calendar was formulated by Zhao Zuo. Due to the age of time and the operation errors, the solar terms were very different. At the time of Emperor Xuanwu of the Northern Wei Dynasty (512-515), Li Yexing formulated a "Wu Zi Yuan Calendar" and presented it to the court at that time, including the 9 families including Zhang Hong, the captain of the Tunqi, and Zhang Longxiang, the general of the bandit. Emperor Xuanwu ordered the 10 calendars to be classified into one, and Zhang Hong and nine other families jointly recommended Li Yexing to be responsible. In the third year of Zhengguang of Emperor Xiaoming of the Northern Wei Dynasty (522), the "Wu Zi Calendar" was formulated and promulgated. Li Yexing also revised it again in the Yin Dynasty, "There are only the Jiayin period, Huangdi Xinmao, and only the Jiyuan period, and , the number of , and the number of was missing." At the beginning of Xinghe (539), Emperor Xiaojing of the Eastern Wei Dynasty, Li Yexing made " Jiazi Yuanli ", "applied at the time". He also participated in the agreement on the "Linzhi New System". Until he was imprisoned, he also created a "Nine Palaces Chess Calendar", "taking five hundred as chapters, four thousand forty as divisions, nine hundred and eighty-seven as Doudi, and taking Jiwei as Yuan as Yuan, it was always one after another and never transferred." Although it is different from the calendar issued by in the Tang Dynasty, "as for the order of the qi and the degree of scenery and the degree of scenery are not different." (Source: Changzhi Party History Local Chronicles Network )
