《宋书·志·卷十二》
何承天也就按照旧有的方法对新方法作丁改变，不再每个月确定大小余，与皮延宗的驳难和太史令的上奏也就相同了。
承天乃改新法依旧术，不复每月定大小余，如延宗所难，太史所上。
He Chengtian also changed his new method according to the old method, and no longer determines the size of the remainder of each month. It is the same as the refutation of Pi Yanzong and the petition of the Taishi (Supreme Historian).