The Great Tang Treatise on Astrology of the Kaiyuan Era, also called the Kaiyuan Star Observations (Kaiyuan Zhanjing), is a Chinese astrology encyclopedia compiled by Gautama Siddha and a team of scholars between 714 and 724 AD during the Kaiyuan era of the Tang Dynasty.

The book is divided into 120 volumes and consists of about 600,000 words. The Kaiyuan Zhanjing incorporates many fragments of other works, including the star catalogues of Shi Shen and Gan De and a translated version of Indian Navagraha calendar at chapter 104. It may have made use of the Yisizhan, compiled by Li Chunfeng around 645. Aryabhata's sine table by the eponymous Indian astronomer, was also translated into the Kaiyuan Zhanjing.

The Kaiyuan Zhanjing ceased to be copied in the 10th century, but was received attention from the scholar Cheng Mingshan in 1616 and was later included in the Siku Quanshu collections of the 18th century.

《开元占经》，唐朝太史监瞿昙悉达在开元年间主持编纂的占星术书。整理中国很多有关占星术、天文学的资料。《开元占经》中包含了印度天文历书九曜的汉译本《九执历》。他于718年将印度数字「〇」（零）引入中国，以此来代替算筹。曾经亡佚，明末在古佛像腹中又发现抄本。

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