《明史·志·卷十三》
月食在午夜以后的，用夜时的一半，加初亏食甚复圆等时间，用一更的时间去减，就得到更的序数。
食在子正已后者，置夜时半之，加初亏食甚复圆等时，以更法减之为更数。
If the lunar eclipse occurs after midnight, add half the nighttime to the time of the initial eclipse, eclipse maximum, and recovery, and subtract it from the time of "geng" to obtain the ordinal number of "geng".
<s>[INST] Analyze the following Classical Chinese passage and provide both a modern Chinese and an English translation: 食在子正已后者，置夜时半之，加初亏食甚复圆等时，以更法减之为更数。 [/INST] Modern Chinese Interpretation: 月食在午夜以后的，用夜时的一半，加初亏食甚复圆等时间，用一更的时间去减，就得到更的序数。 English Translation: If the lunar eclipse occurs after midnight, add half the nighttime to the time of the initial eclipse, eclipse maximum, and recovery, and subtract it from the time of "geng" to obtain the ordinal number of "geng".</s>
Analyze the following Classical Chinese passage and provide both a modern Chinese and an English translation: 食在子正已后者，置夜时半之，加初亏食甚复圆等时，以更法减之为更数。
user
Modern Chinese Interpretation: 月食在午夜以后的，用夜时的一半，加初亏食甚复圆等时间，用一更的时间去减，就得到更的序数。 English Translation: If the lunar eclipse occurs after midnight, add half the nighttime to the time of the initial eclipse, eclipse maximum, and recovery, and subtract it from the time of "geng" to obtain the ordinal number of "geng".
assistant