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About Nhật Nguyệt

Corrections and known issues

Where the site got things wrong, how each was fixed and against which sources; below that, the issues still being fixed or deliberately left as they are. Newest first.

Correction log · Known issues · Report an error

Correction log

The Vietnamese Q&A of four articles: the New Year's Eve tray, the year-end Tất Niên tray, the Đoan Ngọ tray and the Siblings Palace; one sentence in two Tarot articles.

What was wrong
Some answers in the Vietnamese version were written in English.
How it was fixed
Rewritten in Vietnamese with the same content as the English and Chinese versions. New articles are checked for English sentences in the Vietnamese version before they are published.
Checked against
Checked against the matching sentences in the English and Chinese versions of each article.

New Year's Eve offering tray · Year-end Tất Niên tray · Tết Đoan Ngọ offering tray · The Siblings Palace in Tử Vi

The English or Chinese versions of six articles on festivals, customs and folk belief; the Chinese version of the Hỷ Thần star article.

What was wrong
"Cầu mùa" was rendered as 求季节 and 祈季 in Chinese and as "praying for the season" and "seasonal prayer" in English, meaning a prayer to a season rather than for a good harvest. The Hỷ Thần star article rendered "giải hạn" as 解限.
How it was fixed
Corrected to 祈求丰收 and "praying for a good harvest", and "giải hạn" to 解厄. A check for known mistranslations of ritual terms now runs on every article.
Checked against
Checked against the site's ritual-terms glossary and the Vietnamese version of each article.

Tria Lua Festival of the Bru-Van Kieu · First-Furrow Festivals of the New Year · Types of traditional festivals in Vietnam · Customs of Vietnam's ethnic minorities · Vietnamese customs and traditions · Vietnamese folk belief · The Hỷ Thần star in Tử Vi

The Đại Trạch Thổ (Great Estate Earth) article, birth-year table in the Vietnamese version.

What was wrong
The table listed the Mậu Thân year as the Goat and the Kỷ Dậu year as the Rat, contradicting the article's own Q&A.
How it was fixed
Corrected to the Monkey (Mậu Thân) and the Rooster (Kỷ Dậu). The English and Chinese versions were already correct.
Checked against
Checked against the stem-branch values computed by the site's calendar engine.

What is Đại Trạch Thổ?

"Who are you most like" changes how it scores: the Who are you most like tool and the Who's the Real Boss game.

What was wrong
The score was a "likeness" percentage, and the top three often all showed 96 to 99% while sharing only one or two traits; dependent traits (zodiac animal and stem-branch, zodiac sign and birth date) were added as if independent.
How it was fixed
The percentage is gone. Results now rank by how rare the actual shared traits are among seven (zodiac animal, Nạp Âm element, zodiac sign, Life Path, Expression, Soul Urge, Personality), show a low, medium or high match with "1 in N" pairs of strangers, and list exactly which traits match. Dependent traits count once.
Checked against
Measured on 300 random birth dates against 113 celebrity profiles.

Who are you most like? · Who's the Real Boss

The Auspicious hours tool (the part matched to your age) and the Best day for a purpose tool.

What was wrong
Both tools matched you to days and hours by an element derived from the Life Path number (numerology) and the Gregorian birth year, so people born in January or February before Tết got the wrong year. The Best day for a purpose tool also ignored the task you chose when ranking.
How it was fixed
They now use the Nạp Âm element and branch of the lunar birth year, stated in the result, for example someone born 20/1/1990 is Kỷ Tỵ, Đại Lâm Mộc (lunar year 1989). The Best day for a purpose tool now ranks by the task you choose, weighs the day officer, Tam Nương and Nguyệt Kỵ, and gives each day's reason.
Checked against
Nhật Nguyệt's lunar calendar engine (the 60-year cycle and Nạp Âm table).

Auspicious hours · Best day for a purpose

The 12 day officers table (things to do and avoid) in the Vietnamese lunar calendar, How is my day and Best day for a purpose tools and the 12 day officers open dataset; the Thổ Tú star text in Ruling star; the Tam Địa Sát house in House-building age.

What was wrong
The 12 day officers table had four medical items: "Treat illness" (Trừ), "Taking medicine, treating illness" (Mãn), "Treat serious illness, cut decisively" (Phá), "Treating illness, surgery" (Bế). The Thổ Tú star text said to "pay attention to health", and the Tam Địa Sát house said the owner "falls ill easily".
How it was fixed
Those items and sentences were removed in all three languages and not replaced: Nhật Nguyệt gives no medical advice. An automatic check now blocks medical items in the calendar tables. The 12 day officers and 9 ruling stars open datasets moved to version 1.2.0, and the Tam Tai, Kim Lâu, Hoang Ốc dataset to version 1.2.0.
Checked against
Nhật Nguyệt's content rule: no medical content.

The 12 day officers · Vietnamese lunar calendar

The open dataset "24 solar term moments 1900 to 2100", the note on error.

What was wrong
The note said the solar term model is off by 4 to 14 minutes and always earlier than the astronomical value.
How it was fixed
All 4,824 moments were checked against IMCCE: the deviation ranges from 14 minutes early to 9 minutes late, about 3.2 minutes early on average. Since version 1.2.0 each moment carries its own deviation and a near-midnight risk column.
Checked against
IMCCE INPOP (Paris Observatory), 4,824 moments 1900 to 2100; USNO for equinoxes and solstices.

24 solar term moments 1900 to 2100

The article on the Thiên Thọ and Thiên Tài stars in Tử Vi, English version.

What was wrong
The English version said Master Thiên Lương read Thọ as the "fruit" from the Thân palace, contradicting the Vietnamese and Chinese versions.
How it was fixed
Corrected to: Thọ is the cause from the Thân palace, Tài is the fruit from the Mệnh palace, matching the Vietnamese version.
Checked against
The Vietnamese version of the article.

Thiên Thọ and Thiên Tài

The daily lunar calendar pages (/lich-am/<date>), the section on activities suited to the day.

What was wrong
The sentence "By the day officer X, folk custom sees this day as suited to..." also listed activities suggested by numerology, attributing to the day officer things it does not say.
How it was fixed
That sentence now lists only the day officer's activities; the numerology part has its own section.
Checked against
The twelve day officers table in the engine.

Daily lunar calendar

The Personality Number 4 numerology article, Vietnamese and Chinese versions.

What was wrong
The table described number 4 people as "absolutely reliable", stated as fact. The Chinese version carried the tag 越南紫微斗数 and the description 越南神秘学, which do not match the numerology topic.
How it was fixed
The sentence now reports how numerology describes number 4, without "absolutely". The wrong tag was removed; the Chinese description now says 数字命理学.
Checked against
The editorial rule: a system's claims are reported as that system's view, not stated as fact.

Personality Number 4

The lunar leap-month article: TL;DR, body, table and FAQ, in all three languages.

What was wrong
The article said leap months follow the 19-year Metonic cycle, as if that cycle decides which years have a leap month.
How it was fixed
Rewritten after the actual rule: when there are 13 new moons between two winter solstices, the first month without a principal term is the leap month. Seven leap months in 19 years is only the average frequency.
Checked against
The leap-month rule in the lunar calendar engine, cross-checked against NASA new moons and IMCCE solar terms.

Lunar leap month

The Thuần Càn hexagram article, Vietnamese and English versions.

What was wrong
The article called 乾：元，亨，利，贞 the Thoán (Tuan) text.
How it was fixed
That line is the judgment text (quái từ, 卦辞). The Tuan (彖) is the commentary that explains the judgment. The Chinese version already said 卦辞.
Checked against
Zhou Yi, hexagram Qian: 乾：元亨利貞 is the judgment; the part opening with 彖曰 is the Tuan commentary.

Thuần Càn hexagram

Three I Ching hexagram articles: Phong Lôi Ích (42), Sơn Trạch Tổn (41), Hỏa Phong Đỉnh (50), in all three languages.

What was wrong
The Phong Lôi Ích article said the hexagram has two yang lines and four yin lines alternating. The Sơn Trạch Tổn article said the two yang lines are lines 1 and 6, named line 2 Lục nhị (a yin line), and built its explanation on that structure. The Hỏa Phong Đỉnh article said it has three yang and three yin lines alternating.
How it was fixed
Phong Lôi Ích has three yang and three yin lines. Sơn Trạch Tổn has yang lines at lines 1, 2 and 6; line 2 is Cửu nhị (九二), a yang line; the explanation built on the wrong structure was rewritten after the Tuan commentary: 損下益上, decrease below to increase above. Hỏa Phong Đỉnh has four yang and two yin lines (lines 1 and 5).
Checked against
The six-line codes in the engine's 64-hexagram table (checked against Zhu Xi's mnemonic) and the Zhou Yi text. The errors were found by the automated line-count check.

Phong Lôi Ích hexagram · Sơn Trạch Tổn hexagram · Hỏa Phong Đỉnh hexagram

Known issues

No known issues are recorded yet.

Editorial processFour kinds of knowledge