《宋书·本纪·卷三》
永初元年夏六月丁卯，在南郊设立祭坛，登上皇帝位，烧柴祭告上天。
武帝下永初元年夏六月丁卯，设坛于南郊，即皇帝位，柴燎告天。
In the summer of the first year of the Yongchu era, on the day Dingmao in the sixth month, an altar was set up in the southern suburbs. He ascended to the position of Son of Heaven and burned firewood to offer sacrifice to the heavens.