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Free Zi Wei Dou Shu Calculator (Purple Star Astrology Chart)

Check your birth data, then explore the twelve palaces and ten-year periods. Free explanations use fixed rules, with no AI reading or AI analysis quota spent.

Enter birth details

Supports 1901–2050. A traditional hour selection represents a two-hour range, not exact minutes. Natural-language parsing uses the existing parsing and confirmation flow.

Enter birth details

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Min

Tap a number to enter it directly

01/01/2026, 12:00 Wu hour
Gender
Gender
Birth region

Births after 23:00 use the Zi hour of the next day. If you only know the two-hour period, the chart uses that period and is not treated as exact to the minute.

Example: fictional birth details, not your chart

This example shows a complete chart and fixed-rule explanations. Enter your own details and check them before reading a personal chart.

Check birth data

Birth time
1990-06-15 12:00:00 · Recorded to the minute
Lunar
1990-5-23
Time basis
Asia/Taipei · Local civil time
Sex (placement rule)
Male
Calculation details
Original calendar
Gregorian
Gregorian
1990-06-15
Engine calendar date
1990-06-15
Lunar · Engine calendar date
1990-5-23

Natal twelve-palace chart

Life palace (命宮): 子 · Body palace (身宮): Life (命宮) (子) · Fire 6 Bureau

Fire 6 Bureau

Life palace (命宮) 子
Body palace (身宮) 子

Life (命宮) · 戊子 Body palace (身宮)

  • Tian Fu (天府) · Temple (廟)
  • Wu Qu (武曲) · Strong (旺)Quan · agency (化權)

What can be read: fixed-rule reflections

Life (命宮): Here the question is self-positioning and response style, not a personality diagnosis.

Traditionally, Tian Fu in the Life Palace suggests stewardship, steadiness and a wish for security, with stability sometimes becoming inertia. The star is strong here, so its qualities tend to show more easily.

Traditionally, Wu Qu in the Life Palace suggests practicality, directness and execution, with care sometimes expressed more through actions than words. The star is strong here, so its qualities tend to show more easily.

Wu Qu (武曲) Quan · agency (化權): Quan highlights initiative and responsibility. Check that authority matches duties; it does not promise status.

The twelve palaces explainedThe fourteen main stars explained

Birth-year transformations use text and color, not good/bad scores. Brightness labels come from a fixed table and are not ratings.

Lu · resources (化祿) · Tai Yang (太陽) · Parents (父母宮)Quan · agency (化權) · Wu Qu (武曲) · Life (命宮)Ke · recognition (化科) · Tai Yin (太陰) · Parents (父母宮)Ji · friction (化忌) · Tian Tong (天同) · Siblings (兄弟宮)

Decadals: ten-year reading periods

Nominal age: one in the birth lunar year, increasing at lunar New Year. The first decadal starts at the element-class number. These periods do not align directly with BaZi luck cycles.

Forward · Current period as of: 2026-09-30 (Asia/Taipei) · 37

  1. 6–15 · 1995–2004 · Life (命宮)
  2. 16–25 · 2005–2014 · Parents (父母宮)
  3. 26–35 · 2015–2024 · Inner life (福德宮)
  4. 36–45 · 2025–2034 · Property (田宅宮) · Current
  5. 46–55 · 2035–2044 · Career (官祿宮)
  6. 56–65 · 2045–2054 · Friends (交友宮)
  7. 66–75 · 2055–2064 · Travel (遷移宮)
  8. 76–85 · 2065–2074 · Health (疾厄宮)
  9. 86–95 · 2075–2084 · Wealth (財帛宮)
  10. 96–105 · 2085–2094 · Children (子女宮)
  11. 106–115 · 2095–2104 · Spouse (夫妻宮)
  12. 116–125 · 2105–2114 · Siblings (兄弟宮)

What would you like to explore?

Chart facts

Career (官祿宮) · Life (命宮) · Wealth (財帛宮) · Travel (遷移宮)

What can be read: fixed-rule reflections

Career (官祿宮): Here consider work roles, responsibility and working style, not promised promotions or a prescribed profession.

Chart evidence: Career (官祿宮)

Traditionally, Tian Xiang in the Career Palace suggests support, administration and fair coordination within a team.

Chart evidence: Career (官祿宮)Tian Xiang (天相)

Traditionally, Zi Wei in the Career Palace suggests a preference for leadership and room to make decisions rather than a narrowly assigned role.

Chart evidence: Career (官祿宮)Zi Wei (紫微)

Life (命宮): Here the question is self-positioning and response style, not a personality diagnosis.

Chart evidence: Life (命宮)

Traditionally, Tian Fu in the Life Palace suggests stewardship, steadiness and a wish for security, with stability sometimes becoming inertia. The star is strong here, so its qualities tend to show more easily.

Chart evidence: Life (命宮)Tian Fu (天府)

Traditionally, Wu Qu in the Life Palace suggests practicality, directness and execution, with care sometimes expressed more through actions than words. The star is strong here, so its qualities tend to show more easily.

Chart evidence: Life (命宮)Wu Qu (武曲)

Wu Qu (武曲) Quan · agency (化權): Quan highlights initiative and responsibility. Check that authority matches duties; it does not promise status.

Chart evidence: Life (命宮)Wu Qu (武曲)Quan · agency (化權)

Wealth (財帛宮): Here consider acquiring, allocating and managing resources, not income amounts or investment returns.

Chart evidence: Wealth (財帛宮)

Traditionally, Lian Zhen in the Wealth Palace suggests ambition around resources and an association of earning with expertise or relationships, with emotion-driven spending worth checking. The star is strong here, so its qualities tend to show more easily.

Chart evidence: Wealth (財帛宮)Lian Zhen (廉貞)

Travel (遷移宮): Here consider unfamiliar settings, movement and external interactions, not guaranteed relocation outcomes.

Chart evidence: Travel (遷移宮)

Traditionally, Qi Sha in the Travel Palace suggests independent exploration of unfamiliar places, rather than a promise of success away from home. The star is strong here, so its qualities tend to show more easily.

Chart evidence: Travel (遷移宮)Qi Sha (七殺)

What can change: choices and conditions

Relationships, skills, resources and circumstances change. Use these prompts to review choices; natal charts and decadals are not yearly event predictions.

What cannot be determined

Reproducible rules are not scientific proof of life predictions. A single star cannot determine profession, income, marriage dates, illness or lifespan. This layer does not interpret annual transits, flying stars or unverified patterns. Empty palaces receive no invented stars; co-located major stars must be considered together. Changed data or rules may change a chart; historical snapshots keep their versions.

Zi Wei deep reading with BaZi comparison

Purchasing is not available yet. A future complete report covers career, relationships, wealth and the current ten years; the domain selection only changes the first chapter shown.

iztro@2.6.1 · ziwei-tianpan-lny-half-leap-forward-zi-v1 · ziwei-default-ten-stems-v1 · iztro-2.6.1-brightness-v1 · ziwei-readings-v3

How to read a Zi Wei Dou Shu chartUsing AI with a verified chartBaZi and Zi Wei compared

How this chart is calculated

Normalize original inputs → calendar and boundaries → life/body palaces → five-element class → major/auxiliary stars → birth-year transformations → decadals. The server calculates; the browser receives chart JSON.

Heaven chart with the pinned placement rules. Year boundary: lunar New Year. Leap month days 1–15 use the current month; day 16 onward uses the next. Late Zi from 23:00 advances the whole calendar day; early Zi does not. IANA zones resolve original civil time. Nonexistent DST times are rejected; repeated times require an explicit choice. To compare charts, check original clock/zone, solar correction, day boundary, leap month and rule versions.

Zi Wei Dou Shu is also written Ziwei, Tzu Wei Dou Shu or ZWDS, and is often called Purple Star Astrology.

iztro@2.6.1 · ziwei-tianpan-lny-half-leap-forward-zi-v1 · ziwei-default-ten-stems-v1 · iztro-2.6.1-brightness-v1

Four Transformations (Si Hua) table by year stem

The birth-year Four Transformations depend on the heavenly stem of your birth year. Find the year stem on your chart, then see which four stars become Hua Lu, Hua Quan, Hua Ke and Hua Ji, and which palaces they sit in.

Year stemLu · resources (化祿)Quan · agency (化權)Ke · recognition (化科)Ji · friction (化忌)
甲Lian Zhen (廉貞)Po Jun (破軍)Wu Qu (武曲)Tai Yang (太陽)
乙Tian Ji (天機)Tian Liang (天梁)Zi Wei (紫微)Tai Yin (太陰)
丙Tian Tong (天同)Tian Ji (天機)Wen Chang (文昌)Lian Zhen (廉貞)
丁Tai Yin (太陰)Tian Tong (天同)Tian Ji (天機)Ju Men (巨門)
戊Tan Lang (貪狼)Tai Yin (太陰)You Bi (右弼)Tian Ji (天機)
己Wu Qu (武曲)Tan Lang (貪狼)Tian Liang (天梁)Wen Qu (文曲)
庚Tai Yang (太陽)Wu Qu (武曲)Tai Yin (太陰)Tian Tong (天同)
辛Ju Men (巨門)Tai Yang (太陽)Wen Qu (文曲)Wen Chang (文昌)
壬Tian Liang (天梁)Zi Wei (紫微)Zuo Fu (左輔)Wu Qu (武曲)
癸Po Jun (破軍)Ju Men (巨門)Tai Yin (太陰)Tan Lang (貪狼)

Schools differ slightly on this table, most often for the Geng and Ren years. This calculator uses the table below, so its charts always match it; if another tool disagrees, compare the tables first.

Learn to read the chart

How to read a Zi Wei Dou Shu chartThe twelve palaces explainedThe fourteen main stars explainedBaZi and Zi Wei comparedUsing AI with a verified chart

Frequently asked questions

What birth details are required?

Provide Gregorian or lunar date, leap-month flag, sex, birthplace timezone and birth time. True solar time also needs coordinates. Sex is used only for placement/direction rules.

What if my birth time is unknown?

Date and calendar can be checked, but life/body palaces, star positions and ten-year periods need a birth hour. We do not assume noon, generate a unique chart, call AI or charge credits.

How do I enter a lunar or leap-month date?

Select lunar and enter the recorded date with its leap flag. We retain both original lunar and converted Gregorian dates. Do not manually shift the month for the half-leap rule.

Can timezone or Zi-hour boundaries change a chart?

Heaven chart with the pinned placement rules. Year boundary: lunar New Year. Leap month days 1–15 use the current month; day 16 onward uses the next. Late Zi from 23:00 advances the whole calendar day; early Zi does not. IANA zones resolve original civil time. Nonexistent DST times are rejected; repeated times require an explicit choice. To compare charts, check original clock/zone, solar correction, day boundary, leap month and rule versions.

Why do tools produce different charts?

Compare time, zone, solar correction, year/day boundaries, leap-month rules and transformation tables, then find the first differing fact ID. Agreement does not establish predictive accuracy.

What do empty palaces and transformations mean?

An empty palace has no major star but may contain auxiliary stars. Birth-year Lu, Quan, Ke and Ji mark themes, not four luck scores.

How do free and paid readings differ?

Check your birth data, then explore the twelve palaces and ten-year periods. Free explanations use fixed rules, with no AI reading or AI analysis quota spent. Purchasing is not available yet. A future complete report covers career, relationships, wealth and the current ten years; the domain selection only changes the first chapter shown.

How can I verify the copied text?

Check original/effective clocks, calendar date and versions, then compare stable palace, star, transformation and decadal IDs. Text contains birth details; remove them before sharing with AI and retain the chart facts.

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