《晋书·志·第七章》
郎中李恩认为： 以太史推算的天象与实际天象互相比较发现，二年七月、三年十一月望与推算天度均有差异，推算的月食发生时刻落后实际天象六个半时辰，与相差三度的说法不一样，应定为后天过半天多。 
郎中李恩议： 以太史天度与相覆校，二年七月、三年十一月望与天度日皆差异，月蚀加时乃后天六时半，非从三度之谓，定为后天过半日也。 
Physician-in-waiting Li'en argued that: By comparing the celestial phenomena calculated by the imperial astronomers with the actual celestial phenomena, we can discover that there were differences between the calculated celestial degree and the actual celestial phenomena in July of the second year and November of the third year. Besides, the calculated time when the lunar eclipse occurs is six and a half hours behind the actual time, which is different from the statement of a difference of three degrees. Thus, it should be set as more than half a day later.