《晋书·志·第七章》
他研究对比据两历推算的日、月运动状况，弦、望、朔、晦出现的时间，花了三年时间，对两历的不同之处，仍然无法决定其取舍。
其所校日月行度，弦望朔晦，历三年，更相是非，无时而决。
He spent three years studying the comparison of the calculated sun and moon movements, times of new moons, full moons, first quarters, and last quarters by the two different calendars, however, he still could not decide which calendar to select due to their differences.