《隋书·列传·卷四十三》
其二，按星辰旧率计算，运行一周，要出现两次，自古历法，都认为如此，对于应该出现而没出现的情况，就没有人能观测到了。
其二，辰星旧率，一终再见，凡诸古历，皆以为然，应见不见，人未能测。
Secondly, according to the old rate of stars, it should appear twice in a week, and the ancient calendar all think so, but no one can observe the situation that should appear but did not appear.