First, the content composition of Friends Book Instrument and the development of Lunar Greeting Instrument. Dunhuang "Friends Book Instrument" is a kind of book instrument in the form of moon instrument. There is generally only one group of December letters handed down from generation to generation, but the content of Friends Book Instrument is richer than them. At the beginning of the document, there is a line "Debate the date of autumn and winter [spring and summer]". Here are time phrases that list the dates of the year. Since then, there has been a line of "December Debate" linking the two groups of December letters. Zhao Heping1February's argument is a summary of the language used in the previous month, but the author thinks that these two arguments are actually subheadings listed by Yi Shu. Books and documents are therefore divided into two parts. "Debate" seems to mean distinction and distinction, just like discrimination. In the previous debate (discrimination), words were used to distinguish differences. Now that "the moon" has been included, the following debate (debate) is to open the following. Among them, the word "Wen" in Xiang Bian Wen refers to calligraphy, which is different from the simple words in the past. There are two "arguments", that is, all the books and instruments of friends. These two "arguments" can help us understand the content structure of lunar instruments. Today's surviving lunar instrument only sees the latter's "December debate", but not the former. However, Mr. Zhou Yiliang once pointed out that under Cai Yong's "Sui Shu" and "Persuasion", there is a note ",Death". The primary school books of the Ministry of Classics are works of writing, phonology and exegesis. However, judging from the titles of Cai Yong's "Encouraging Learning", Zhu Yu's "Youxue" and Wu Langzhong's "Beginners" in the notes, there are also some books on children's education, which obviously include "Leyi". As a kind of universal knowledge, Leyi is understandable, among which there is naturally the problem of procedural writing of letters. However, from the text interpretation and basic understanding of things, listing the dates of autumn and summer [spring and summer] should be one of the original contents. The works of lunar instruments handed down from ancient times are either incomplete because of the spread of calligraphy, or their contents have been simplified. The appearance of friend book instrument may prove this content. It can be seen that the characters in Friends' Book Distinguishing Year and Moon are sorted out from various classic ancient books and idioms at that time. These contents are part of understanding nature in ancient times, and there are dozens of related contents recorded in ancient books in the Tianbu and Timekeeping Department of Taiping Magnolia. As Zhao Heping said, the language in Friends comes from Erya, the language of the four seasons in December. Some of them can be seen to be similar to the compilation of Emperor Liang Yuan quoted in "Elementary School" and "Taiping Magnolia". But there are also many differences, but I can't see which book it originated from. This shows that the text about identifying the year and month is still quite short, just for practical purposes. If the same part of the early lunar instrument was the same, it would be too hasty to accept it. It is difficult to infer the original appearance of the early moon instrument from the friend instrument, but I believe it should be more elegant than the friend instrument. Fortunately, the terms about the year, month and day are not only found in friends' books, but also often included in the "Chronological Teaching Instrument" section of good and bad books found in Dunhuang. I'm not sure whether the similar content is absorbed by the good book instrument or the bad book instrument from the moon instrument. But interestingly, early good and bad calligraphers and latecomers are also different in this respect.
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