BaZi Reverse Lookup
Enter the eight characters of the four pillars to list every solar date and two-hour branch between 1900 and 2100 that matches them.
Four pillars to birth time
This page looks for a birth moment from the four pillars. Enter the stem and the branch of the year, month, day and hour column, choose the gender, and the page lists every solar date and two-hour branch between 1900 and 2100 that carries that set of eight characters. Pick one and press View Result: the chart is built from that moment, with life phases, Nayin and symbolic stars on the same BaZi Chart result page.
On that page, the five-element panel (share ring, radar, useful elements) requires sign-in.
On that page, energy curves for life phases, years and months require sign-in.
On that page, timing inference lets you pick year through hour to stack phase stems and branches on the chart and requires sign-in.
Legal stems and branches only
The popups carry only legal pairings, and each cell commits one character. The year stem opens first, its branch follows it, and a column opens only once the one above it is full. The month and hour stem cells list ten stems in the order the rules produce them, so one committed stem leaves two branches: a Jia year and a Ji year both start the first month on Bing Yin, so choosing Bing as the month stem leaves Yin and Zi, and Jia on the hour stem of a Jia day leaves Zi and Xu. The rules behind these lists come from the calendar. Year stem and year branch share a polarity: Jia pairs with Zi, Yin, Chen, Wu, Shen and Xu, Yi with Chou, Mao, Si, Wei, You and Hai. The month column follows the year stem by the five-tiger rule, the day column turns the 60-cycle one day at a time with six branches fitting any one stem, and the hour column follows the day stem by the five-rat rule. A pairing outside these rules cannot be chosen, so nothing has to fail after the fact.
Many dates, one pillar set
One set of pillars usually matches more than one day. The year column returns every 60 years, so a given year pillar appears three to five times inside the range; the month column depends on which solar-term segment the date falls in, and the term moments move from year to year, so the same month branch covers different solar dates in different years; the day column simply advances through the 60-cycle. Filtered down, a legal set of pillars commonly yields a few dozen entries, each with its two-hour window.
Solar dates and branch starts
The search reads the solar calendar only. Times are given at the start of a branch: Zi opens at 23:00, Chou at 1:00, and the rest follow two hours apart. No true-solar-time correction is applied and no lunar or leap month is involved. The entry you pick hands its year, month, day, hour and minute to the BaZi Chart, which recomputes the four pillars from the same calendar data and lands back on the set entered here.
No pick among candidates
The page does not choose among the entries. Dates that share one set of pillars produce one and the same chart, and telling which of them is an actual birth belongs to a birth record, not to a tool.
FAQ
How many columns does the reverse lookup need?
All four: eight characters in total, stem and branch for the year, month, day and hour, plus the gender. With a column missing nothing is searched, because the month column is read from the year stem and the hour column from the day stem.
Why can some stems and branches not be chosen?
Those pairings do not exist in the calendar. Stems and branches share a polarity, the month column follows the five-tiger rule and the hour column the five-rat rule, so the popups leave the illegal items out instead of letting a choice fail after it is made.
A dozen dates come back - which one is right?
The page does not decide. Every one of them charts the same set of pillars; only the solar date and the two-hour window differ. Deciding which is an actual birth takes a birth certificate or the time the family kept.
Is the chart from a reverse lookup the same as one entered by date?
It is. The entry you pick hands a solar year, month, day, hour and minute to the same computation used by the BaZi Chart page, and the four pillars come back equal to what was entered here. The one difference: the reverse search applies no true-solar-time correction and reads no lunar or leap month.
Can pillars before 1900 or after 2100 be searched?
No. The range is fixed at 1900 to 2100, the same year span the BaZi Chart page on this site supports.
