《南齐书·志·卷九》
郑玄的话是说 不清楚周代明堂在哪月祭祀，《月令》中是在季秋 。
玄之言曰： 未审周明堂以何月，于《月令》则以季秋。 
Zheng Xuan said that it was unclear in which month the Mingtang was offered sacrifices during the Zhou Dynasty, and that it was in the late autumn in the "Monthly Calendar."