《晋书·志·第八章》
我先前利用制典的空余时间，推算考察天体的运行，考核以前的典籍，以日食和朔验证，详细精密，建立了更为精密的历法，推算不先不后，与古今天象相符。
是以臣前以制典余日，推考天路，稽之前典，验之以蚀朔，详而精之，更建密历，则不先不后，古今中天。
Previously, I used my spare time in making the calendar to make calculation and assess the celestial operations, examine the previous classics, taking the solar eclipse and new Moon as confirmation, detailed and precise, I built an even more accurate calendar, the calculations were neither too early nor too late, and consistent with the celestial phenomena of the past and the present.