Xu Ang (Chinese: 徐昂; pinyin: Xú Áng) was a Chinese court astronomer of the Tang dynasty.
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.
In 822, during Emperor Muzong's reign, he created the Xuanming calendar, 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.
References
- ^ Chen Jiujin (陈久金) (2008). "徐昂" [Xu Ang]. In Chen (ed.). 中国古代天文学家 [Astronomers of Ancient China] (in Chinese). China Science and Technology Press. pp. 272–280. ISBN 978-7-5046-4839-6.
- Qu Anjing (2002). "Revisiting an Eighth-Century Chinese Table of Tangents". In Ansari, S. M. Razaullah (ed.). History of Oriental Astronomy: Proceedings of the Joint Discussion-17 at the 23rd General Assembly of the International Astronomical Union, Organised by the Commission 41 (History of Astronomy), Held in Kyoto, August 25–26, 1997. Springer Science+Business Media. p. 220. ISBN 978-90-481-6033-4.
- Lee, Ki-Won (2019). "Analysis of Solar and Lunar Motions in the Seonmyeong Calendar" (PDF). Journal of Astronomy and Space Sciences. 36 (2): 87. Retrieved 18 July 2021.
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