《明史·本纪·卷十》
正统十一年正月十一日，在京城南郊大祭天地。
十一年春正月己卯，大祀天地于南郊。
On January 11 of the 11th year of the Zhengtong reign, the emperor offered a grand sacrifice to the heavens and the earth in the southern suburbs of the capital.