About Nhật Nguyệt
How Nhật Nguyệt works
Everything Nhật Nguyệt says passes through three layers. Follow any figure to see where it comes from.
Knowledge
Sources are classified; each type has its own purpose, scope and limits. No type is assumed to be absolutely right.
1,413published articles68glossary entries108sources in useLicensed press, government bodies and institutes, international academic sources and reference sites, grouped on the Editorial process page.
- Calendar and astronomyComputed and cross-checked.
- Culture and beliefA record of custom, with sources.
- Traditional divinationOne school's rules, not empirically tested.
- Modern systemA recent system; research does not support it.
- Published researchPublished research, cited.
The four kinds of knowledge and the labels inside articles · The seven fields
How it is computed
Labels show the type of information, not a verdict on a whole tradition.
15coded rules16textual sources on file4,824solar-term instants cross-checkedIMCCE, 1900 to 21002,474new moonsChecked against NASA, 1901 to 2100804equinoxes and solsticesChecked against USNO, 1900 to 2100error of the solar-term instantsSolar-term instants differ from IMCCE by 4.2 minutes on average over 4,824 instants; 95% are within 9.7 minutes.
In the open
Nhật Nguyệt does not ask you to take its word; everything you need to check is here.
Data release 2026.10.06-d7437bc3
How Nhật Nguyệt builds its knowledge · Editorial process · DOI