《宋书·志·卷十三》
矗垩三年，当时历法推算丁丑曰是冬至，交节气时刻正在中午，将其减去两天十二刻，由天象确定乙亥曰为冬至，交节气的时刻在午夜之后三十八刻。
嘉平三年，时历丁丑冬至，加时正在日中。以二日十二刻减之，天定以乙亥冬至，加时在夜半后三十八刻。
In the third year of Yongchu, the winter solstice was calculated by the current calendar to be on the day of Dingchou, with the change of solar term occurring at noon. Subtract two days and twelve kes from this and determine based on the astronomical events that the winter solstice is on the day of Y亥, with the change of solar term occurring thirty-eight kes after midnight.