《宋书·志·卷十四》
元嘉二十年，太祖准备亲耕籍田，因这种仪式长久被废止，便指示何承天拟定仪式。
元嘉二十年，太祖将亲耕，以其久废，使何承天撰定仪注。
In the 20th year of Yuanjia, Taizu prepared to cultivate the land by himself, and because this ceremony had been abolished for a long time, he instructed He Chengtian to formulate the ceremony.