《明史·志·卷五十八》
方泽、朝日坛，爵采用红黄玉制成，求索不能得到，在陕西边境购买，派使者到阿丹寻求，离土鲁番西南二千里。
方泽、朝日坛，爵用红黄玉，求不得，购之陕西边境，遣使觅於阿丹，去土鲁番西南二千里。
The square altar and sunrise altar, the sacrificial chalices were made of red and yellow jade, but after searching could not be found, so they were purchased on the border of Shaanxi, and an emissary was sent to seek them in Aden, two thousand miles southwest of Turfan.