佛祖統紀 35.114

35.114

述曰。漢因秦以十月建亥為正。雖文景之盛不能革。正月建寅用夏正也。孔子所謂行夏之時。至漢武始能行之。正音政。舊音征。今不用。書怠棄三正。詩正月。左傳春王正月。漢書改正朔。並無音文。書正月上日。音征又如字。此蓋陸德明順古避始皇諱故音征至今。人間猶作征音。殊不知去秦既遠自合削去。今人尚不知避孔聖諱。豈有讀其書行其教而不知避。此儒生君子所當聞諸　朝著于令為可也。

The Narrator says: The Han followed the Qin in taking the tenth month, the establishment of the Hai branch, as the first month of the year. Even during the prosperity of Emperor Wen and Emperor Jing, this could not be changed. Taking the first month, the establishment of the Yin branch, employs the Xia calendar. What Confucius referred to as 'following the seasons of the Xia' could only be implemented when Emperor Wu of the Han arrived. The character *zheng* (正) is pronounced with the departing tone (*zhèng*); the old pronunciation was the level tone (*zhēng*), which is no longer used today. In the *Classic of Documents*, 'carelessly casting aside the three calendar arrangements,' in the *Classic of Poetry*, 'in the first month,' in the *Zuo tradition*, 'in the spring, the king's first month,' and in the *Book of Han*, 'revising the calendar and the first day of the month'—none of these have phonetic glosses. In the *Classic of Documents*, 'on the first day of the first month,' it is glossed with the pronunciation *zhēng* and also read according to the regular pronunciation. This was probably because Lu Deming complied with antiquity and avoided the taboo name of the First Emperor of Qin, thus pronouncing it *zhēng* down to the present day. People among the commoners still make the *zhēng* sound, utterly unaware that, being far removed from the Qin, it ought naturally to be discarded. Today, people still do not know how to observe the taboo name of Sage Confucius. How could one read his books and practice his teachings yet not know how to observe his taboo? This is something that Confucian scholars and gentlemen should present to the court to be enacted into law, which would be proper.