《宋史·志·卷三》
天田九颗星，在斗宿南面，一说在牛宿东南，是天子王畿内的田地。
天田九星，在斗南，一曰在牛东南，天子畿内之田。
The nine stars of Tianteng are located south of Dou Constellation, and it is said to be in the southeast of the Bull Constellation. It is the land within the imperial domain.