折疑論 3.137

3.137

在天之中（又步天歌中。所謂天之中有三垣。若品字而排。第一紫微垣。第二太微垣。第三天市垣。外有二十八宿。分位兼諸餘星以理取之。其辰正在天之中也）。

is in the center of heaven. (Also in the *Song of the Pacing of the Heavens*, what is called the center of heaven has Three Enclosures arranged like the character 品: the first is the Ziwei Enclosure; the second, the Taiwei Enclosure; the third, the Tianshi Enclosure. Outside there are the twenty-eight lunar mansions, their assigned positions combining with the remaining stars; taken in principle, its asterism is precisely in the center of heaven.)