The 《欽定協紀辨方書》 is the Qing court's manual for choosing days, and its entry for 嫁娶 (jiàqǔ, a wedding) lists ten marks that suit a wedding and twenty that count against one. We ran that entry against all 365 days of 2027. Before any of the manual's lifts, 20 days carry none of the twenty and do carry 不將 (bùjiāng), one of the ten. The almanac table in the open-source lunar-javascript library marks 130 days as suiting a wedding, and only 15 of those 20 are among them. Keep those 15, add the yellow path, which the entry never uses, and the main text's rule that a 月忌 day takes no wedding entry, and one day of 2027 is left. The manual's appendix, reprinting an older almanac, says a 月忌 day does not bar a wedding.
Twenty marks against a wedding form the entry's mesh
The text used is the Wikisource transcription of the 四庫全書本, chapter 11, read on 8 November 2026, a manuscript copy whose readings may differ from the printed palace edition. The suiting list reads 「宜天徳月徳天徳合月徳合天赦天願三合天喜六合不將」. The twenty against are not all spirits: three are day officers, 平, 收 and 閉 (see how a day in the almanac is built), one is 月破, the day opposing the month, and one is any 亥 day. The neighbouring entries for arranging a match and for betrothal gifts also forbid 月建 and 滿 days. The wedding entry does not, and adds 厭對, 往亡 and the 亥 day.
We computed twelve of the twenty from the manual's own rules in chapters 4 to 6. The other eight come from the spirit lists of the open-source lunar-javascript library, which agree with the manual's month rules on all 130 listed days of 2027. Counts below come before chapter 10's lifts unless they say otherwise.
Chapter four's own rule sifts out the whole 不將 list
Chapter 4 builds 不將 from 月厭 (yuèyàn), a spirit stepping backwards through the branches: 「厭前幹配厭後枝者為隂陽不將也」, a stem from before it paired with a branch from after it, with 戊 and 己 allowed only in some seasons. It then prints the result, 12 or 13 stem-branch days a month, 150 in all.
Our code of that rule reproduces all 150 cells and adds none, reading 夘 as 卯 and the eighth month's 「癸己」 as 癸巳. The library's 不将 field differs from the list in two cells, lacking 七月壬申 and adding 十月己丑. In 2027 the list gives 77 days, 35 of them among the 130.
The editors did not make it a requirement. Chapter 4's note says it is 「凡事可用非僅施之嫁娶也」, a day for any event, except 六月戊午. Their note under 月破 in chapter 10 says the old edition gave weddings only 不將 days, then quotes the almanacs: 「日辰全吉無不將亦可用」, where the day is fully good otherwise, it may be used without one.
The yellow path does the coarse sieving, though the entry never names it
None of the table's 130 wedding days falls on 月破, 往亡 or a 亥 day; from 1990 to 2060 the table breaks them in one cell, 丑月乙亥. The yellow path (黃道, huángdào) covers 182 days of 2027 and 70 of the 130. Chapter 11 does not use it, and chapter 10's note says the black-path spirits forbid nothing in particular (「並無專忌之事」). The rule is in the guide to yellow and black path hours.
Set to 1 January to 31 December 2027, a wedding, no zodiac and black-path days hidden, this wedding date selector shows those 70 and flags 43: 18 for a day officer, the rest for 厭對, 八專, 月厭, 四忌 or 月忌. It lifts 厭對 on 26 January (by 天德合 and 月德合), on 6 February (Lunar New Year, by 月德) and on 29 April (by 天赦). Thursday 14 January carries 厭對 with none of the five spirits chapter 10 lets lift it, and stays flagged. Ten days carry a 不將 badge. Of the 27 unflagged days, 8 carry an item it does not compute, leaving 19. Solar-term days count whole in the new month, as in the library's day table.
Before a correction dated 8 November 2026, the page said everything testable from the date was tested. It skipped 厭對, 月厭, 八專, 四忌, 四窮 and 四廢, flagged 18 of the 70 and showed no 不將.
Main text and appendix strain 月忌 days in opposite ways
月忌 (yuèjì) is the 5th, 14th and 23rd of each lunar month. Chapter 6 rules 「月忌日止註祭祀…餘事不註」: such a day carries a few rites and chores and nothing else. Its note adds that the state does not use the day either, and chapter 10 repeats the rule. Chapter 35, the appendix, says 「凡月忌日不忌嫁娶」, yet its editors' closing note says that material came from the 通書大全 and that people did not much follow its chosen days (「世亦不甚遵信」).
In 2027, 36 days are 月忌, 14 of them listed and 8 among the 70. Read strictly, the yellow path takes the 130 listed days to 70, and 18 of those carry none of the twenty. Two of the 18 are 不將, and one, Wednesday 19 May 2027, is lunar 四月十四. Under chapter 6, one day remains.
A chapter on building and burial grades clashes from year down to hour
The zodiac clash in wedding lists comes from chapter 33, in a section on whose birth year governs a choice: the head of the house for building, the deceased for a grave. It ranks the clash 「太歳衝命最凶月次之日又次之時為輕」, year worst and hour lightest.
It then grades by the person's branch. For 辰戌丑未 natives a clash is 「不吉但略輕」, unlucky but lighter, unless the year is the one clashing; for 申酉 natives clashed by 寅卯, and 亥子 natives clashed by 巳午, it brings only disputes. The reverse pairings are 「凶莫堪矣」. In 2027 the year pillar is 丙午 until 立春 on 4 February, clashing the Rat, and 丁未 after, clashing the Ox.
Four folk taboos go out with the chaff, and 月厭 stays in the grain
Chapter 36 says nothing misleads worse than the best-months-for-a-bride scheme (「未有如合婚大利月之尤甚者」). Of 楊公忌, thirteen days a year, 2 of them among 2027's 70, it says 「邪説誣民莫此為甚」. It mocks the dog's body-part names of 天狗, yet that passage opens 「嫁娶最忌月厭」. On 紅沙 it argues 「是不得以極為凶也」, while keeping the 丑 day of each season's last month bad on other grounds; counted by solar month, our reading, it touches none of the 70.
三娘煞, six fixed days of each lunar month in folk lists, appears in none of the thirteen chapters we opened. By that definition it falls on 13 of the 70.
Day rules screen each day alone, so a year without 立春 goes unseen
The lunar year 丁未, 6 February 2027 to 25 January 2028, has no 立春. The table lists a wedding on 126 of its 354 days (35.6%), against 122 of 354 the year before and 135 of 384 after. By share it is in line with its neighbours. Every entry in the table is fixed by solar month and stem-branch day, so nothing about a year can move it, and none of the chapters we opened mentions a year without spring. Why 2027 has none is worked out in the guide to the no-spring year.
