Inside Nhat Nguyet: a sourced knowledge base, a search that answers, and an AI that cites

Most apps about calendars and traditions give you an answer and ask you to trust it. We built the opposite: over 1,700 articles in three languages, where every claim can be traced back to a book, an archive or an institution.

Here are the three ways in.

1. Browse: follow the map

• 7 fields: calendar and astronomy, customs and festivals, regional and ethnic traditions, the I Ching, Purple Star astrology, feng shui, and research that tests these traditions.

• The knowledge map: over 1,000 connected topics, from the basics to advanced, so you always know what to read next.

• A dictionary for the terms you keep meeting: the sexagenary cycle, the five elements, the 24 solar terms.

• Every article tells you what kind of knowledge it is: a computed calendar fact, a documented custom, a folk belief, or one school’s rule, each marked in the text and explained here. Footnotes point to the exact source.

2. Search: it answers, not just lists

Type a question the way you would ask a person. When a calculation can answer it, you get the answer at the top, not ten links:

• “1984 zodiac” → Year of the Wood Rat, its element, and where the lunar new year falls, computed by our calendar engine.

• “full moon this month” → the date, in both calendars.

• “what to avoid when building a house” → passages quoted word for word from our articles, with the source.

Behind it: lunar calendar math, a synonym dictionary, a trilingual index, and a semantic layer that finds articles even when your words don’t match theirs. On our test set of nearly 500 real questions, the right article comes first 92% of the time. Quick answers are quoted, never invented.

3. Ask: an AI that shows its sources

Nhat Nguyet AI answers from our published articles and numbers every claim, so you can open the source. Before an answer reaches you, any citation that doesn’t match its source is removed.

• For dates and calendar questions it calculates with the same engine instead of guessing.

• It says what is tradition and what is proven. Ask “How will my year be?” and it tells you plainly that no one can predict that, then explains what the traditions say.

• It runs behind a content guardrail and never reads your private data without consent.

Open by design

The calendar data behind all of this is cross-checked against NASA and the Paris Observatory and published with a DOI on Zenodo, GitHub and Hugging Face.

Start anywhere: nhatnguyet.org/en/kien-thuc