《宋书·志·卷十六》
孝建二年正月庚寅日，主事官员上奏说： 本月十五日举行南郊祭祀。
孝建二年正月庚寅，有司奏： 今月十五日南郊。
On the day Keng-yin of the first month of the second year of the Hsiao-chien era, the presiding officers submitted a memorial, saying: "It is proposed to perform the southern suburban sacrifice on the 15th of this month."