[Pramāṇa](https://indike.org/pramana/) › People › Gautama Siddha (Qutan Xida) # Gautama Siddha (Qutan Xida) (瞿曇悉達) Astronomer of an Indian family settled in Chang'an, director of the Tang Astronomical Bureau; translated the Indian Navagraha calendar (Jiuzhi li, 718) and compiled the Kaiyuan zhanjing. ## Works (1) - [開元占經](https://indike.org/pramana/inf.cn.tang.kaiyuan-zhanjing) — Classical Chinese; 718–728 CE; partly digitised --- Source: [https://indike.org/pramana/person/gautama-siddha](https://indike.org/pramana/person/gautama-siddha) · Pramāṇa