《汉书·志·五行志下之下》
京房《易传》上说： 大凡日食不在晦朔日的，就叫逼迫。
京房《易传》曰： 凡日食不以晦、朔者，名曰薄。
Jing Fang said in the Easy Classic: In general, a solar eclipse which does not occur on the last day of the month or on the first day of the next month is called a forced one.