Xu Ang ( Chinese: 徐昂; pinyin: Xú Áng) was a Chinese court astronomer of the Tang dynasty. [1]
Shortly after Emperor Xianzong's ascension in 805, he created the Guanxiang Calendar (觀象曆), which was used throughout Emperor Xianzong's reign beginning in 807. [1]
In 822, during Emperor Muzong's reign, [1] he created the Xuanming calendar, [2] one of the most influential calendars in the world. It was used for 71 years in China, for at least 475 years in Korea, and for 823 years in Japan. [3]
Xu Ang ( Chinese: 徐昂; pinyin: Xú Áng) was a Chinese court astronomer of the Tang dynasty. [1]
Shortly after Emperor Xianzong's ascension in 805, he created the Guanxiang Calendar (觀象曆), which was used throughout Emperor Xianzong's reign beginning in 807. [1]
In 822, during Emperor Muzong's reign, [1] he created the Xuanming calendar, [2] one of the most influential calendars in the world. It was used for 71 years in China, for at least 475 years in Korea, and for 823 years in Japan. [3]