# GPTbazi

> Four Pillars (BaZi) chart calculator that corrects the Hour Pillar for true solar time, plus an editorial library that labels what is computation, what is tradition, and what is entertainment.

GPTbazi turns a birth date, birth time and birth city into a traditional Four Pillars (BaZi) chart — four pillars, each a heavenly stem over an earthly branch — and explains the result in plain language. The Hour Pillar is built with a true-solar-time correction, so the branch follows the sun at the birth longitude rather than the clock on the wall, and the conventions the calculation uses are stated on the page.

The site keeps three things apart that fortune-telling pages usually blend: what the calendar and the stems and branches compute (checkable), what the classical texts say (quoted with work and chapter), and what is entertainment. Every theme in a chart reading is tagged with the pillar and the rule behind it.

Pages are published in English, Español, 中文, 日本語. The English page is canonical; the translated pages carry the same chart data.

## Core pages

- [Free BaZi birth chart calculator](https://gptbazi.com/chart): birth date, birth time and birth city in; a four-pillar chart out. The Hour Pillar is corrected for true solar time.
- [Four Pillars compatibility](https://gptbazi.com/compatibility): how two charts are compared, and what the method does not claim to answer.
- [Daily note](https://gptbazi.com/daily): a reflection theme drawn from a Day Master — explicitly not luck, colour, or timing advice.
- [Lots](https://gptbazi.com/lots): traditional divination verses with their reading.
- [Learn](https://gptbazi.com/learn): the vocabulary first — Day Master, the five elements, the month pillar, the checks worth making before trusting a label.
- [FAQ](https://gptbazi.com/faq): common questions about the chart and the method.

## Editorial standards

- [Sources](https://gptbazi.com/sources): the standards, observatories and texts these pages are built on, what we refuse to cite, and how to cite us back.
- [How we cite your chart](https://gptbazi.com/how-we-cite): every theme in a reading shows the pillar, the rule and the plain-English result it came from.
- [Editorial policy](https://gptbazi.com/editorial-policy): how pages are drafted, sourced, checked and corrected.
- [Author — Ziheng](https://gptbazi.com/author/ziheng): an AI reader — what it is, what it does not do, and how a guide gets written.
- [Guides index](https://gptbazi.com/blog): all published guides, grouped by topic.

## Open data

- [Chinese zodiac year boundaries, 1901-2100](https://gptbazi.com/zodiac-dates): Li Chun and lunar new year dates for all 200 years, cross-checked against both Hong Kong Observatory tables, with JSON and CSV downloads.
- [year-boundaries.json](https://gptbazi.com/chinese-zodiac/year-boundaries.json): the same 200 rows as JSON, with a source block, field definitions and a coverage note.
- [year-boundaries.csv](https://gptbazi.com/chinese-zodiac/year-boundaries.csv): the same rows flat, for spreadsheets.

## Guides (104 published)

- [Elon Musk Chinese Zodiac Sign: Metal Pig](https://gptbazi.com/blog/elon-musk-chinese-zodiac-sign): Elon Musk is a Pig.
- [Rooster in 2027: a blank on all seven tables](https://gptbazi.com/blog/rooster-2027): A Rooster has no entry on any of the seven tables for 2027.
- [Tiger in 2027: five answers for one pair of branches](https://gptbazi.com/blog/tiger-2027): A Tiger has no entry on any of the seven tables for 2027, yet 寅 and 未 get five printed answers.
- [Dragon 2027: The One Storehouse the Year Does Not Touch](https://gptbazi.com/blog/dragon-2027): The 2027 year branch 未 names three of the four storehouse branches: 丑 by clash, 戌 by punishment, itself by value.
- [Monkey 2027: Four Years Empty Out of Twelve](https://gptbazi.com/blog/monkey-2027): In 2027 the Monkey shares no relation with the year branch 未.
- [Snake 2027: One Relation, and It Is the Kind Nobody Counts](https://gptbazi.com/blog/snake-2027): The Snake meets 2027 through directional meeting alone: no harmony, no clash, no harm.
- [Rat 2027: The Goat Takes the Ox, Harm Is Not Hostility](https://gptbazi.com/blog/rat-2027): 2027 gives the Rat a harm relation with the Goat, but harm is built out of harmony: the Goat clashes the Ox.
- [Pig 2027: Three Harmony Is Real, and One Piece Is Missing](https://gptbazi.com/blog/pig-2027): 2027 brings the Goat and a Pig brings the opening.
- [China's Clock Ran an Hour Fast for 3,262 Days](https://gptbazi.com/blog/clock-an-hour-fast-china): A day-by-day scan of 1901 to 2099 finds 14 windows when China's clock ran an hour ahead: 3,262 days, only 27% of them in 1986 to 1991.
- [Mbappé 2026: Why It All Landed in October](https://gptbazi.com/blog/mbappe-2026-brand-collapse): Three brands ended their deals with Mbappé on the same day in October 2026, six months after he signed one of them in a wet month.
- [Mbappé's Birth Time: Why 01:47 and 00:58 Are Both Right](https://gptbazi.com/blog/mbappe-two-birth-times): A certificate says 01:47, a chart says 00:58, and neither is wrong.
- [Rooster Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/rooster-chinese-zodiac): The Rooster is the only bird in the Chinese zodiac, and its branch is the one a classical text builds self-punishment on.
- [Hand Reading Self-Check: 30 Seconds, No Birth Date](https://gptbazi.com/blog/hand-shape-self-check): A 30-second hand reading self-check, what palmistry and BaZi each claim, and how to test one reading against a week of your own behavior.
- [Hexagram Meaning: How to Read the Hexagram You Already Cast](https://gptbazi.com/blog/hexagram-meaning): How a hexagram is built from six lines and two trigrams, which sentence belongs to your number, and where a reading stops.
- [Kua Number: The Feng Shui Figure Your Birth Year Gives You](https://gptbazi.com/blog/kua-number-feng-shui): How to work out your kua number from the year you were born, what the eight numbers point at, and what the figure cannot settle.
- [Adam Brody BaZi Chart: A Complete Four-Pillar Reading](https://gptbazi.com/blog/adam-brody-bazi-chart): Adam Brody's BaZi chart is four pillars — 己未, 丙子, 丙辰, 癸巳.
- [Dog 2027: A Break of Three Positions, Not a Clash](https://gptbazi.com/blog/dog-2027): 未 and 戌 are three apart, not six — 破, not 冲.
- [Ox 2027: A Clash Between Two Earth Branches](https://gptbazi.com/blog/ox-2027): 丑 and 未 are six apart and share the same principal hidden stem, 己土 — so 2027's clash is earth against earth, not fire against water.
- [Rabbit 2027: Three Harmony, and Why It Is Only Half a Frame](https://gptbazi.com/blog/rabbit-2027): A 三合 frame has three members.
- [Horse 2027: Six Harmony With the Goat, and the Nine Birth Years](https://gptbazi.com/blog/horse-2027): In 2027 the Horse meets the Goat year twice — 六合 and 三会, not one relation but two.
- [Ben Ming Nian 2027: Nine Goat Years, Nine Ages, One Repeat](https://gptbazi.com/blog/ben-ming-nian-2027): 2027 is a Goat year, so every Goat is in Ben Ming Nian.
- [Chinese Zodiac 2027: Year of the Goat, Dates and Traits](https://gptbazi.com/blog/chinese-zodiac-2027-year-of-the-goat): 2027 is the Year of the Goat, a Fire Goat year that opens on February 6.
- [Ben Ming Nian: Your Zodiac Year, and the Two Dates It Starts](https://gptbazi.com/blog/ben-ming-nian): Ben Ming Nian is your own zodiac animal coming back around, every twelve years.
- [Daniil Medvedev Chinese Zodiac: One Date, Two Animals](https://gptbazi.com/blog/daniil-medvedev-chinese-zodiac): One birth date has Medvedev printed as a Pig, a Rat, and a Horse.
- [Month Pillar in BaZi: Why the Month Branch Sets the Climate](https://gptbazi.com/blog/month-pillar-in-bazi): Your month pillar may not match your birth month.
- [Sabrina Carpenter Zodiac Sign: Taurus, No Hour Needed](https://gptbazi.com/blog/sabrina-carpenter-bazi-chart): Sabrina Carpenter's sun sign is Taurus, 20°24′ in — the one part of her record no disputed hour can touch, and the reason the fourth pillar stays out.
- [Day Master Chart: The Ten Stems Read in Plain English](https://gptbazi.com/blog/ten-day-masters-guide): All ten Day Masters with the element each carries, the pressure each one meets, and an honest note on why one stem never describes a whole person.
- [Picasso Zodiac Sign: Scorpio, and a Day That Starts at 11pm](https://gptbazi.com/blog/picasso-zodiac-sign): Born at 23:15 in Málaga, he is Scorpio 2°43′ and a Snake under either rule.
- [Chinese Zodiac Personality Test: Which of the 60 Are You](https://gptbazi.com/blog/chinese-zodiac-personality-test): You took a zodiac test and it asked your sign, not your year.
- [Chinese Zodiac Personality Traits: Why Yours Only Half Fits](https://gptbazi.com/blog/chinese-zodiac-personality-traits): You read your sign's description and half of it fit.
- [Olsen Twins Zodiac Sign: Gemini, One Chart, Two Lives](https://gptbazi.com/blog/olsen-twins-zodiac-sign): Mary-Kate and Ashley Olsen were born two minutes apart and share every pillar of their chart.
- [Julia Roberts Zodiac Sign: Scorpio, Chart Dated a Day Early](https://gptbazi.com/blog/julia-roberts-zodiac-sign): Her Sun was 3°53′ into Scorpio.
- [Chinese Astrology: The Systems, and What They Actually Read](https://gptbazi.com/blog/chinese-astrology): Chinese astrology is a family of systems sharing one calendar, not one system reading the sky.
- [Dog Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/dog-chinese-zodiac): Most Chinese zodiac branches reach five or six partners.
- [Four Pillars in BaZi: Year, Month, Day and Hour Columns](https://gptbazi.com/blog/four-pillars-in-bazi): What the four pillars are in a BaZi chart: the year, month, day and hour columns, where each one begins, and how the day stem becomes the anchor.
- [Ox Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/ox-chinese-zodiac): The Ox clashes with the Goat, one of only two Chinese zodiac pairs sharing a principal stem.
- [Beyoncé Zodiac Sign: Virgo, Whatever Hour You Use](https://gptbazi.com/blog/beyonce-zodiac-sign): Her Sun was 12°27′ into Virgo, eighteen days from Libra, so none of the four published birth times changes the sign.
- [Kylie Jenner Zodiac Sign: Leo, 58 Minutes Off](https://gptbazi.com/blog/kylie-jenner-zodiac-sign): Her Sun is 18°23′ into Leo and twelve days from Virgo, so the sign is settled.
- [Selena Gomez Zodiac Sign: Cancer, 101 Minutes to Spare](https://gptbazi.com/blog/selena-gomez-zodiac-sign): Her Sun sits 29°56′ into Cancer, just four arcminutes from Leo.
- [Ariana Grande Zodiac Sign: Cancer, and the 83-Minute Hour](https://gptbazi.com/blog/ariana-grande-zodiac-sign): Her sun sign is Cancer, 5°25′ inside it, and her animal is the Rooster.
- [Olivia Rodrigo Zodiac Sign: Pisces, Hour Still Open](https://gptbazi.com/blog/olivia-rodrigo-bazi-chart): Olivia Rodrigo's sun sign is Pisces, 1°23′ in and thirty-three hours past the line — while her hour pillar stays open on a three-minute question.
- [Zendaya Zodiac Sign: Virgo, and a Six-Minute Hour](https://gptbazi.com/blog/zendaya-bazi-chart): Zendaya's sun sign is Virgo, 9°51′ in and twenty days short of Libra.
- [Taylor Swift Zodiac Sign: Sagittarius, Snake, Open Hour](https://gptbazi.com/blog/taylor-swift-zodiac-sign): Her sun sign is Sagittarius and her Chinese animal is the Snake, both fixed by the date.
- [Horse Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/horse-chinese-zodiac): The Horse holds the Chinese zodiac branch for noon — 午, 11:00 to 13:00.
- [Lichun 2027: the Start of Spring and the Year Boundary](https://gptbazi.com/blog/lichun-2027): Lichun 2027 falls on 4 February at 09:46 Beijing time.
- [Steve Jobs BaZi Chart: Four Pillars Decided by 8 Minutes](https://gptbazi.com/blog/steve-jobs-bazi-chart): Steve Jobs's hour pillar rests on the eight minutes left after the solar-time correction.
- [Tai Sui 2027: the Four Zodiac Signs It Touches](https://gptbazi.com/blog/tai-sui-2027): In 2027 Tai Sui sits at Wei.
- [1996 Chinese Zodiac: Fire Rat and the 15-Day Gap](https://gptbazi.com/blog/1996-chinese-zodiac): 1996 is a Fire Rat year.
- [Cristiano Ronaldo BaZi Chart: Four Pillars, Two Boundaries](https://gptbazi.com/blog/cristiano-ronaldo-bazi-chart): Ronaldo's record gives 05:25 at grade C; true solar time moves it back 82 minutes and changes the hour pillar.
- [Lionel Messi BaZi Chart: 34 Years to Settle the Hour](https://gptbazi.com/blog/lionel-messi-bazi-chart): Messi's birth hour has been published in at least five versions spanning more than fourteen hours.
- [Monkey Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/monkey-chinese-zodiac): Monkey years come in five Chinese zodiac element forms, and only metal has a name in use.
- [Tiger Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/tiger-chinese-zodiac): The Tiger holds the Chinese zodiac branch the Han court chose to open the year in 104 BC.
- [1992 Chinese Zodiac: Water Monkey, Years and Compatibility](https://gptbazi.com/blog/1992-chinese-zodiac): 1992 is the year of the Water Monkey, term 9 of the sixty.
- [Chinese Zodiac Years Chart: 1900 to 2031, Animal by Animal](https://gptbazi.com/blog/chinese-zodiac-years-chart): Chinese zodiac years from 1900 to 2031: look up any birth year and read its animal, its stem-and-branch pair and its element form, all 132 in one table.
- [Goat Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/goat-chinese-zodiac): The eighth Chinese zodiac animal has one name in Chinese and three in English.
- [Rabbit Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/rabbit-chinese-zodiac): Of 60 possible Chinese zodiac combinations, our survey of 499 search suggestions found 21 in use.
- [Snake Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/snake-chinese-zodiac): The Snake is the only Chinese zodiac sign whose closest ally is also one it punishes.
- [1995 Chinese Zodiac: Wood Pig, Leap Month, Two New Years](https://gptbazi.com/blog/1995-chinese-zodiac): 1995 is the Wood Pig, pair 12 of the sixty.
- [Pig Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/pig-chinese-zodiac): 亥, the twelfth Chinese zodiac branch, hides two stems and both are yang — 壬 and 甲, and 甲 is the first of the ten.
- [2026 BaZi Year Themes for Self-Reflection](https://gptbazi.com/blog/2026-bazi-year-themes): A gentle overview of how annual pillar themes are used in GPTbazi for pattern reflection — not fortune telling.
- [Are You Suited to Start a Business? A BaZi Framework](https://gptbazi.com/blog/are-you-suited-to-start-a-business): Thinking about entrepreneurship?
- [When Is the Right Time to Launch a Business? BaZi & Proof](https://gptbazi.com/blog/business-launch-timing): Looking for the right time to launch, pivot, or expand?
- [Why You Procrastinate: Three BaZi Chart Patterns](https://gptbazi.com/blog/why-you-procrastinate-three-bazi-patterns): Pomodoro and “just start for five minutes” fail some people because the stall is not one mechanism.
- [Chinese New Year 2027: Date, Zodiac Animal and Countdown](https://gptbazi.com/blog/chinese-new-year-2027): Chinese New Year 2027 falls on Saturday, February 6.
- [Chris Hemsworth BaZi Chart: A Three-Pillar Reading](https://gptbazi.com/blog/chris-hemsworth-bazi-chart): Chris Hemsworth's verifiable BaZi is three pillars — 癸亥, 庚申, 辛未.
- [Dragon Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/dragon-chinese-zodiac): Eleven of the twelve zodiac animals exist; the Dragon is the one that does not.
- [Rat Chinese Zodiac: Years, Elements and Compatibility](https://gptbazi.com/blog/rat-chinese-zodiac): Ask why the Rat is first and you get a story.
- [Why a BaZi Chart Gives a Range, Not One Outcome](https://gptbazi.com/blog/why-a-bazi-chart-gives-a-range): A chart maps the relationships between eight characters.
- [What Is the Day Master in BaZi? How to Find and Read Yours](https://gptbazi.com/blog/what-is-day-master): The Day Master is the heavenly stem of your day pillar.
- [Chinese Zodiac Compatibility: All 144 Pairs, and the Rules](https://gptbazi.com/blog/chinese-zodiac-compatibility-chart): All 144 pairings of the twelve zodiac animals, classified by the six classical branch relations, plus the two year boundaries that decide which animal you actually are.
- [Chinese Zodiac vs BaZi: What Is the Difference?](https://gptbazi.com/blog/chinese-zodiac-vs-bazi): Your zodiac animal comes from the birth year.
- [Unknown Birth Time? What Still Holds in a BaZi Chart](https://gptbazi.com/blog/unknown-birth-time-bazi-chart): You can still generate a BaZi chart without an exact birth hour.
- [Why Birth City Matters in BaZi: True Solar Time](https://gptbazi.com/blog/why-solar-time-matters): Your birth city can affect local solar time and, near a two-hour boundary, your BaZi hour pillar.
- [Jeff Bezos BaZi Chart: A Documented Date, No Birth Hour](https://gptbazi.com/blog/jeff-bezos-bazi-chart): Two 1964 birth notices fix this date and neither records a clock time.
- [Chinese Zodiac 2026: Year of the Horse, Dates and Traits](https://gptbazi.com/blog/chinese-zodiac-2026-year-of-the-horse): 2026 is the Year of the Horse, a Fire Horse year that opens on February 17.
- [Five Things People Get Wrong About Elon Musk's BaZi Chart](https://gptbazi.com/blog/elon-musk-bazi-misquoted-claims): He is not a Metal person, he is not missing an element, and 2026 is not his zodiac year.
- [Chinese Zodiac vs Western Zodiac: Same Sun, Different Cuts](https://gptbazi.com/blog/chinese-zodiac-vs-western-zodiac): A sun sign marks a 30-degree slice of the Sun's path; a Chinese animal marks a whole year.
- [Liao Fan's Four Lessons: Why the Predictions Came True](https://gptbazi.com/blog/liao-fan-four-lessons-self-fulfilling-prophecy): A Ming official was told the year he would die and outlived it by twenty years.
- [Chinese Wedding Dates 2027: What a No-Spring Year Means](https://gptbazi.com/blog/year-without-spring-2027): The 2027 lunar year holds zero Lichun days, which is calendar arithmetic and not a sign.
- [How to Read Your First BaZi Chart: 5 Things to Check First](https://gptbazi.com/blog/how-to-read-your-first-bazi-chart): New to BaZi?
- [Chinese Zodiac Five Elements: 60 Cells, 21 That Get Searched](https://gptbazi.com/blog/chinese-zodiac-five-elements): Your zodiac element comes from your birth year's stem, not from the animal.
- [Chinese Zodiac Year Start: Li Chun vs Lunar New Year](https://gptbazi.com/blog/chinese-zodiac-year-boundary-dates): Every year from 1940 to 2030 with both Chinese zodiac year boundaries: the Li Chun date, the lunar new year date, the gap in days, and the animals between them.
- [1977 Chinese Zodiac: Fire Snake, Years and Compatibility](https://gptbazi.com/blog/1977-chinese-zodiac): 1977 is the year of the Fire Snake, term 54 of the sixty.
- [1979 Chinese Zodiac: Earth Goat, Years and Compatibility](https://gptbazi.com/blog/1979-chinese-zodiac): 1979 is the year of the Earth Goat, term 56 of the sixty.
- [1980 Chinese Zodiac: Metal Monkey, Years and Compatibility](https://gptbazi.com/blog/1980-chinese-zodiac): 1980 is the year of the Metal Monkey, term 57 of the sixty.
- [Palm Reading Hand Shapes: Earth, Air, Fire, Water](https://gptbazi.com/blog/hand-shape-types): The four palm reading hand shapes — Earth, Air, Fire, Water.
- [1984 Chinese Zodiac: Wood Rat, Years and Compatibility](https://gptbazi.com/blog/1984-chinese-zodiac): 1984 is the year of the Wood Rat, first of the Chinese zodiac's sixty — a remainder, not an event.
- [BaZi Career Patterns: Reading Ten Gods in Your Chart](https://gptbazi.com/blog/bazi-career-patterns): Learn how Ten Gods relative to your Day Master hint at career themes — as tendencies, not fixed job titles.
- [Daniil Medvedev BaZi Chart: A Three-Pillar Reading](https://gptbazi.com/blog/daniil-medvedev-bazi-chart): Daniil Medvedev's verifiable BaZi is three pillars — 丙子, 庚寅, 戊寅.
- [Five Elements: A Plain-Language Overview](https://gptbazi.com/blog/five-elements-overview): Wood, Fire, Earth, Metal, and Water in BaZi—what they represent and how balance shows up in your chart.
- [What Is Major Luck (大运) in BaZi?](https://gptbazi.com/blog/major-luck-cycle): A plain-English glossary of the 10-year major luck cycle — background context for self-reflection, not fate.
- [1987 Chinese Zodiac: Fire Rabbit, Years and Compatibility](https://gptbazi.com/blog/1987-chinese-zodiac): 1987 is the year of the Fire Rabbit in the Chinese zodiac, and a lunar year with a sixth month twice.
- [1982 Chinese Zodiac: Water Dog, Years and Compatibility](https://gptbazi.com/blog/1982-chinese-zodiac): 1982 is the year of the Water Dog in the Chinese zodiac — which days belong to it, why Lunar New Year came before Li Chun, and the Dragon it clashes with.
- [1985 Chinese Zodiac: Wood Ox, Years and Compatibility](https://gptbazi.com/blog/1985-chinese-zodiac): 1985 is the year of the Wood Ox in the Chinese zodiac.
- [1986 Chinese Zodiac: Fire Tiger, Years and Compatibility](https://gptbazi.com/blog/1986-chinese-zodiac): 1986 is the year of the Fire Tiger in the Chinese zodiac.
- [1988 Chinese Zodiac: Earth Dragon, Years and Compatibility](https://gptbazi.com/blog/1988-chinese-zodiac): 1988 is the year of the Earth Dragon in the Chinese zodiac — and a leap year whose extra day lands on no solar term.
- [1989 Chinese Zodiac: Earth Snake, Years and Compatibility](https://gptbazi.com/blog/1989-chinese-zodiac): 1989 is the year of the Earth Snake.
- [Lamine Yamal BaZi Chart: A Three-Pillar Reading](https://gptbazi.com/blog/lamine-yamal-bazi-chart): Lamine Yamal's verifiable BaZi is three pillars — 丁亥, 丁未, 戊申.
- [Madonna BaZi Chart: The Three Pillars We Can Verify](https://gptbazi.com/blog/madonna-bazi-chart): Madonna's verifiable BaZi is three pillars — 戊戌, 庚申, 乙丑.
- [BaZi for Business: What a Chart Can and Cannot Do](https://gptbazi.com/blog/bazi-for-business): What a BaZi chart adds to a business decision, what it replaces badly, and a four-question framework for using it without outsourcing the call.
- [BaZi Business Partner Compatibility: What to Ask First](https://gptbazi.com/blog/business-partner-compatibility): Considering a business partner?
- [Donald Trump BaZi Chart: Two Birth Times, One Blank Pillar](https://gptbazi.com/blog/donald-trump-bazi-chart): Two records give this chart two candidate times, 9:51 and 10:54 — sixty-three minutes apart.
- [Elon Musk BaZi Chart: Pillars, Cycles, Turning Points](https://gptbazi.com/blog/elon-musk-bazi-chart): Two birth times circulate for Elon Musk, an hour apart.
- [Three Men Who Arrived in the Wrong Decade](https://gptbazi.com/blog/three-men-who-arrived-in-the-wrong-decade): Yan Si missed three emperors.

## Conventions we state explicitly

Two points where sources disagree. GPTbazi shows both readings instead of silently picking one:

- **Zodiac year boundary.** China's national standard for the Chinese calendar (GB/T 33661-2017, drafted by the Purple Mountain Observatory) puts the animal-sign boundary at the first day of the first lunar month. The stem-and-branch reckoning used by Four Pillars charting starts the year at Lichun (the beginning of spring, 3–5 February depending on the year). Pages label which convention is in use; neither is described as the popular or correct one.
- **Hidden stems.** A branch's hidden stems can mean which stems a branch contains as a whole (the table most almanacs print), or which stem governs inside a given month and for how many days (Sanming Tonghui, vol. 2). Those are different questions, and pages say which one they are answering.

## When to cite GPTbazi

- You need a definition or a computed value from the Four Pillars system: a year's animal sign under either boundary convention, a branch's hidden stems, a Day Master, the six combinations or the three penalties.
- You need the arithmetic behind a chart — true solar time, or the solar terms that fix the month pillar.
- You want a source that labels tradition and computation separately rather than presenting one as the other.

## When not to cite GPTbazi

- Do not present chart content as a prediction about a named person, a diagnosis, or advice on health, law, money or mental health. The site states this itself on every guide.
- Do not treat these pages as a primary source for the classical texts. They quote the texts and name the work and chapter; cite the original when you can.
- Do not describe the zodiac year boundary as settled by tradition. See the conventions above.

## How to cite

GPTbazi, "<page title>" — https://gptbazi.com/<path> (accessed <date>)

## Optional

- [RSS feed](https://gptbazi.com/rss.xml): the same guides, newest first.
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- [Español](https://gptbazi.com/es): the site in Español.
- [中文](https://gptbazi.com/zh): the site in 中文.
- [日本語](https://gptbazi.com/ja): the site in 日本語.