Open data
Download the reference tables as CSV
Every reference table on Nhật Nguyệt is generated by the same engine that powers the tools, so the numbers here and the numbers a tool returns are the same numbers. The 22 datasets below, 91,143 rows in all, download as CSV for reuse.
The same data is also on Hugging Face, with bilingual dataset cards, and on GitHub, with runnable Python and JavaScript examples and a document naming where the schools disagree.
The ten heavenly stems
The ten heavenly stems with the five-element attribution and yin-yang polarity of each.
10 rows · 8 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The ten heavenly stems. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/10-thien-can.csv
Compatibility matrix of the 12 earthly branches
The relation between every pair of the 12 earthly branches, 144 rows, in long form with one pair per row.
144 rows · 8 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Compatibility matrix of the 12 earthly branches. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/12-con-giap-hop-khac.csv
The twelve earthly branches
The twelve earthly branches with their zodiac animal, five-element attribution and two-hour window.
12 rows · 9 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The twelve earthly branches. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/12-dia-chi.csv
The twelve day officers (Thap Nhi Truc)
The twelve day officers in cycle order, with their meaning and the tasks each day suits or avoids.
12 rows · 9 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The twelve day officers (Thap Nhi Truc). Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/12-truc.csv
The 22 Major Arcana of the Tarot
The Major Arcana with Vietnamese and English names, keywords, and upright and reversed meanings.
22 rows · 10 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The 22 Major Arcana of the Tarot. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/22-an-chinh-tarot.csv
The 24 solar terms
The solar date each of the 24 terms begins, for every year from 2020 to 2035, computed from solar longitude in Vietnam time.
384 rows · 10 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The 24 solar terms. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/24-tiet-khi.csv
The 56 Minor Arcana cards
The complete Minor Arcana across four suits, with Vietnamese and English names, keywords, upright and reversed meanings. Together with the existing 22 Major Arcana it makes the full 78-card deck.
56 rows · 10 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The 56 Minor Arcana cards. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/56-an-phu-tarot.csv
Sexagenary cycle table (60 Hoa Giap)
All 60 stem-branch pairs with their Na Yin five-element attribution and the lunar years they cover between 1924 and 2043.
60 rows · 11 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Sexagenary cycle table (60 Hoa Giap). Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/60-hoa-giap.csv
The 64 hexagrams of the I Ching
All 64 hexagrams in King Wen order, with Vietnamese and Han names, upper and lower trigrams, and the image.
64 rows · 11 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The 64 hexagrams of the I Ching. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/64-que-kinh-dich.csv
The nine presiding stars (Cuu Dieu)
The nine stars with their classification, reading, and the lunar ages they fall on, listed separately for men and women.
9 rows · 8 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The nine presiding stars (Cuu Dieu). Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/9-sao-chieu-menh.csv
Zodiac sign boundaries year by year, 1950 to 2050
The date and time the sun enters each zodiac sign, computed per year instead of using a fixed boundary.
1,212 rows · 11 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Zodiac sign boundaries year by year, 1950 to 2050. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/bien-cung-hoang-dao-1950-2050.csv
Letter to number tables, Pythagorean and Chaldean
The numeric value of each letter in both numerology systems, with the convention for Vietnamese diacritics and the letter D with stroke.
33 rows · 7 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Letter to number tables, Pythagorean and Chaldean. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/chu-sang-so-than-so-hoc.csv
Kua number and Bat Trach directions
Kua number by birth year and sex for 1900 to 2099, with the four favourable and four unfavourable directions.
400 rows · 10 columns · version 1.1.0
Cite as: Nhật Nguyệt (2026). Kua number and Bat Trach directions. Version 1.1.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/cung-phi-bat-trach.csv
Auspicious hours across the sixty-day stem-branch cycle
The twelve double-hours of each day across the sixty-day stem-branch cycle, marking which are auspicious. Sixty times twelve is seven hundred and twenty rows, one full cycle.
720 rows · 8 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Auspicious hours across the sixty-day stem-branch cycle. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/gio-hoang-dao-60-ngay.csv
The sixty stem-branch pairs crossed: sounds, harmony, clash and element relation
Every pair among the sixty stem-branch combinations, three thousand six hundred rows, giving the element relation between their sounds and the branch grouping.
3,600 rows · 12 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). The sixty stem-branch pairs crossed: sounds, harmony, clash and element relation. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/hoa-giap-ghep-cheo.csv
Vietnamese festivals mapped to solar dates, 2026 to 2030
The actual solar date of each festival across five years, with the weekday. Lunar festivals land on a different solar date every year, and this table works that out in advance.
240 rows · 11 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Vietnamese festivals mapped to solar dates, 2026 to 2030. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/le-hoi-quy-doi-ngay-duong.csv
Vietnamese festivals, seasonal feasts and public holidays
Vietnamese folk festivals, seasonal feasts and public holidays, each with its fixed lunar or solar date.
48 rows · 12 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Vietnamese festivals, seasonal feasts and public holidays. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/le-hoi-viet-nam.csv
Vietnamese lunisolar calendar, 1900 to 2100
Every solar day from 1900 to 2100 with its lunar date, leap month flag, day and year stem-branch, the solar term in force and the day officer.
73,414 rows · 14 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Vietnamese lunisolar calendar, 1900 to 2100. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/lich-am-duong-1900-2100.csv
Start moments of the 24 solar terms, 1900 to 2100
The start moment of each solar term across 201 years in Vietnam time, with the solar longitude of the mark and a flag for moments falling close to midnight.
4,824 rows · 11 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Start moments of the 24 solar terms, 1900 to 2100. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/moc-tiet-khi-1900-2100.csv
Folk inauspicious days mapped onto solar dates, 2026 to 2035
Every solar day across ten years, showing whether it falls on Tam Nuong, Nguyet Ky, Sat Chu or Tho Tu, with the lunar date and stem-branch for checking.
3,652 rows · 15 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Folk inauspicious days mapped onto solar dates, 2026 to 2035. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/ngay-ky-dan-gian-2026-2035.csv
Tam Tai, Kim Lau and Hoang Oc by birth year and year in question
Every birth year from 1940 to 2010 crossed with every year in question from 2020 to 2050, showing whether the pair falls under Tam Tai, Kim Lau or Hoang Oc, with the arithmetic shown.
2,201 rows · 13 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Tam Tai, Kim Lau and Hoang Oc by birth year and year in question. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/tam-tai-kim-lau-hoang-oc.csv
Segments of the three Lo Ban rules
The favourable and unfavourable segments on all three Lo Ban rules, with the millimetre range each segment covers in one cycle.
26 rows · 15 columns · version 1.0.0
Cite as: Nhật Nguyệt (2026). Segments of the three Lo Ban rules. Version 1.0.0. CC-BY-4.0. https://nhatnguyet.org/du-lieu/thuoc-lo-ban.csv
Licence and attribution
Everything above is released under CC BY 4.0: reuse commercially, adapt freely, attribution is all that is asked. The minimum attribution line:
Nguồn: Nhật Nguyệt (nhatnguyet.org), CC BY 4.0
The content of these tables is traditional knowledge in the public domain; the licence here covers the work of compiling, cross-checking and rendering it into a machine-usable form.
This dataset records cultural and calendrical conventions, not scientific claims. It is suitable for cultural research, NLP, and calendar applications. It is not intended for predicting events, evaluating people, or making decisions that affect anyone.
