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A different perspective.

The year, month, day and hour each contribute a pair of characters. The “Day Master” is the Heavenly Stem of the day pillar. Traditional interpretation considers relationships, season and the full chart. A quick element count cannot settle what is favourable for a person.

In BaZi, “strength” describes the Day Master’s support within the chart. Traditional assessment considers season, roots and relationships across the pillars; it is not a measure of personal strength. This introductory tool does not assign a strength rating. See Di Tian Sui Chan Wei · Strength and decline.

This tool uses the Gregorian birth date and local civil clock time in your chosen timezone. Year and month boundaries use the solar terms: the year changes at Li Chun (Start of Spring), rather than 1 January or Lunar New Year. Solar-term instants are calculated using the calendar library's UTC+08:00 reference and compared with your birth instant.

The day and hour pillars use your birthplace's local civil clock. The calendar engine's late-Zi “sect 2” convention is used: the day pillar changes at midnight; the hour stem at 23:00 follows that convention's next-day sequence. Other schools may use a different day boundary.

This version does not adjust for longitude or the equation of time (“true solar time”). If your recorded birth time is close to an hour, day or solar-term boundary, different conventions can change a pillar. Historical timezone rules depend on your browser's timezone data.

The hour pillar is left open. The tool also checks whether a solar-month or solar-year boundary falls on that local date. If it does, both possible pillars are shown instead of treating noon as your actual birth time. A traditional reading remains incomplete without a reliable birth time.

The ten Heavenly Stems have a long tradition of imagery. This page draws its short Chinese anchors from Di Tian Sui Chan Wei · Heavenly Stems. Ridge and garden-soil imagery also appears in Di Tian Sui Ji Yao.

Those commentaries discuss, and sometimes challenge, fixed comparisons such as trees, candles, jewels and rain. We use the physical images as an accessible introduction. The English keywords, reflective readings and questions are our editorial interpretation, not a universally agreed personality system or a reading of the whole chart.

Each of the twelve Earthly Branches has a traditional hidden-stem list. The tool looks up that list separately for the year, month, day and hour branches. For example, Wu (午) contains Ding (丁, Yin Fire) and Ji (己, Yin Earth). Si (巳) is a different branch. Repeating a branch repeats its hidden stems; changing only the visible Heavenly Stem does not change that list.

A Ten Gods label comes from comparing a stem’s element and polarity with the Day Master. Shi Shen or Shang Guan in one position is a relationship label. It does not establish a Shi Shen or Shang Guan pattern. The calculated structure therefore stops at the pillars, Day Master, hidden stems and relationship labels. The accompanying reflective reading is separately authored.

A traditional Ge Ju assessment requires a fuller reading of the chart. Depending on the approach, monthly seasonal command, exposed stems, combinations, transformations and the conditions supporting or disrupting a pattern all matter. This tool does not assess them, assign one of eight patterns or turn ten Day Masters × eight relationships into personality types.

Reference: 6tail’s EightChar documentation and its branch/relationship tables. Traditional context: Di Tian Sui Chan Wei · Eight Patterns and Zi Ping Zhen Quan · Changes in the monthly reference.

The calculator runs entirely in your browser with a local copy of lunar-javascript 1.7.7 by 6tail, an open-source calendar library under the MIT licence. English descriptions are concise editorial introductions, not a live AI reading. City and country search uses a local index adapted from GeoNames, under CC BY 4.0: a selected list of cities and administrative centres worldwide, plus Australian towns. Suburbs and very small localities are excluded. Source and adaptation details. Regional timezone conversion uses your browser's Intl date and time support.

There is no account, analytics tracker or birth-data database in this tool. The site remembers your colour preference on your device and, for the current browser session, whether you have opened the colour studio. The hosting service still handles ordinary page requests and access to this site.