The Xieji Bianfang Shu as an almanac source

The imperial compilation

The revision project

The project was authorized in 1739, during the early Qianlong reign. It addressed contradictions in existing date-selection books, including material used by the imperial Astronomical Bureau. Earlier efforts under the Kangxi emperor had produced the Xingli Kaoyuan, but the bureau’s selection manuals still contained rules that the new compilers considered inconsistent.

The work was a collective court project. Jin Ai, an official of the Astronomical Bureau, requested revision. Yunlu, Prince Zhuang, directed the project, with Mei Juecheng and He Guozong involved in its editorial administration. Zhang Zhao joined through a further authorization in 1740. The imperial preface signals the emperor’s endorsement, while the memorials and personnel lists record the officials who organized and carried out the work.

The compilers compared inherited rules, removed repetitions, corrected assignments and supplied explanations. They did not reject date selection as a whole. Their revisions sought a coherent account of its categories and relationships. The imperial preface also acknowledges that some long-established usages remained for the convenience of readers.

This critical purpose extends to the final juan, Bian'e, “Distinguishing errors.” Its discussion of marriage matching attacks rules that the compilers considered inconsistent and liable to delay marriages. Criticism is therefore part of the book’s contents, alongside the rules it accepts.

The thirty-six juan

The contents move from foundations and definitions to tables, practical application and criticism. The following table accounts for all thirty-six textual divisions.

Juan 10 and 11 approach the same material from different directions. Juan 10 begins with named calendrical influences and gives their associated activities. Juan 11 begins with an undertaking and gathers the suitable and avoided conditions beneath it. Together they connect a classification with what a person intends to do.

The book also contains astronomical and timekeeping material. Juan 13 discusses night watches, twilight and stars crossing the meridian, with calculations for the capital. Its procedures relate the hours of observation to changing seasonal conditions, extending the work beyond daily activity lists.

Dates, copies and editions

The prefatory documents record different stages of the project. The authorization following the Ministry of Rites' response falls in the eighth lunar month of Qianlong year four, in 1739. Zhang Zhao’s appointment is recorded in the second lunar month of Qianlong year five, in 1740. The imperial preface is dated Qianlong year six, twelfth lunar month, fifteenth day.

Those dates concern the compilation and its preface. A later printing can reproduce the same preface unchanged. Its date therefore does not establish when every surviving copy was produced. A reign year’s final lunar month can also extend into the following Gregorian year, so an abbreviated reign-year equivalent is not an exact conversion of the full date.

The thirty-six juan are textual divisions, not a required number of bound volumes. A facsimile, a modern typeset edition and a digital transcription can divide the same text differently again.

A passage is most readily located by its juan and activity or section heading. “Juan 11, Yongshi, Anchuang” identifies the entry for arranging a bed across different layouts. A page or leaf number becomes useful once a particular edition has been identified. The Siku Quanshu version belongs to the later imperial manuscript collection; its modern transcription should not be confused with a photographic reproduction of an earlier printed copy.

Following a rule through the text

Activity headings and their qualifications

Juan 11 groups conditions under activities such as marriage, arranging a bed, opening a business, constructing embankments and digging wells. Some headings combine related undertakings, while notes distinguish the conditions that apply to each one.

The entry “Opening channels and digging wells” is a useful example. After a shared list, the text specifies that an additional Ren-day prohibition applies only to opening channels, while a Mao-day prohibition applies only to digging wells. Treating the entry as a single ban on water-related work on Ren and Mao days would erase that distinction.

The relationship between an activity and its day categories is equally specific. Under constructing embankments, Complete and Close days appear among suitable conditions. Close therefore appears as a suitable category for this task, rather than a prohibition on every undertaking. The entry also lists exclusions, so its favourable officers cannot be detached from the rest of the rule.

Rejected rules

Juan 36 needs a different kind of reading because it presents schemes in order to criticize them. Its discussion of the so-called “four inauspicious” days explains their derivation and rejects the reasoning. A table copied from that discussion without its rebuttal could make a rejected practice look like an approved rule.

The same applies to marriage matching and supposedly advantageous marriage months. The compilers examine the schemes' underlying relationships and argue that their restrictions are unfounded within the systems they claim to use. They also object to their practical effects on the timing of marriages. These passages reveal active debate within date-selection learning, rather than a body of rules accepted without disagreement.

Historical text and modern almanacs

The book preserves detailed connections among activity names, cyclical categories and exceptions. A modern almanac may adopt some of those connections, simplify them or use a different combination of rules. Turning a passage into a calculation requires decisions about its terms, boundary conventions and qualifications.

The Atlas’s activity tables are not a digital transcription of the whole Xieji Bianfang Shu. The historical work remains useful for understanding why particular categories occur together and how their applications were argued. Its scope includes both the construction of rules and the criticism of rules that its compilers chose not to retain.