Xu Ang

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]

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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[chen-1] 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.

[2] 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.

[3] 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.