《宋史·志·卷三》
按汉朝永元铜仪，唐朝开元游仪，房宿五度。
按汉永元铜仪、唐开元游仪，房宿五度。
According to the Yongyuan copper instrument of the Han Dynasty and the Kaiyuan celestial sphere of the Tang Dynasty, there are five degrees in the Fang House.