《明史·志·卷七》
十五年，礼部员外郎郑善夫进言说： 日月亏食，日食最为难测。
十五年，礼部员外郎郑善夫言： 日月交食，日食最为难测。
In the 15th year, Zheng Shanfu, a member of the Ministry of Rites, stated that among solar and lunar eclipses, solar eclipses are the most difficult to predict.