《晋书·志·第七章》
推弦、望定大、小余时，可加减平弦、望大余以定之。求朔弦望加时定度：
弦望进退大余，为定小余。求朔弦望加时定度
When pushing the string and looking at the big and small margins, the flat string and the big margins of the full moon can be added or subtracted to determine it. Request for the determination of the degree of increase or decrease in time of Shuo, string and Wang: