Bazi (Chinese astrology) vs Western astrology: what's the difference?

BaZi and Western astrology both start from the birth moment, and they write different records of it. BaZi writes four pillars, year, month, day, and hour: eight characters made of Heavenly Stems and Earthly Branches. Western astrology writes the places of the Sun, the Moon, and the planets along the ecliptic, plus the Ascendant and the houses. The same noon can sit in a Zi month and under a Capricorn Sun, because the month branch and the tropical sign open on different markers.

Health, legal, and financial questions belong with the person qualified to keep that record. See a professional for a diagnosis, a contract, or a tax figure.

What does a BaZi chart record at birth?

A BaZi chart records four pillars. Each pillar is one Heavenly Stem and one Earthly Branch, so one birth moment is eight characters. Sanming Tonghui, in the Siku Quanshu text that names Wan Minying of the Ming, sets those pillars up from the stems and branches of the year, the month, the day, and the hour, and treats that arrangement as the natural record for reading a life.

The same preface keeps a second title beside this one. It says Xingxue Dacheng, the book on the five planets, was written by Wan Minying, and that the present book, which treats Ziping, also comes from his hand. The eight characters are that Ziping record: stems and branches. A stem-and-branch pillar is not a longitude of a planet.

The Heavenly Stem of the day pillar is the Day Master. Finding it, and why its strength comes from the whole chart, is in what the Day Master is. The month branch is the Month Command, the season. The year pillar changes at Start of Spring, and each month branch opens on a sectional solar term. The 12 double-hours are in what a BaZi chart shows.

What does a Western birth chart record at the same moment?

A Western birth chart records places on the ecliptic. Tetrabiblos, in Ashmand's 1822 translation, opens with two studies. The first is the figurations of the Sun, the Moon, and the stars, and their aspects to each other and to the earth. The second is the changes those aspects produce in what they influence. For that second study the book says that no positive or infallible rules can be set down, because the material acted on is weak and variable.

Book III calls the reading of one person's birth Genethlialogy, the science of nativities. Particular events are traced to the origin at birth, and later stretches are read from that origin by a division of time. The signs are spans of 30 degrees. Capricorn is the first 30 degrees after the winter solstice, Cancer the first 30 after the summer solstice, Aries the first after the vernal equinox, and Libra the first after the autumnal equinox.

The Ascendant is the sign rising on the eastern horizon, so the figure asks for the place as well as the clock. Houses set topics around that horizon; what the 12 cover is in what the 12 houses rule. Sun, Moon, and Ascendant keep different clocks, as in rising sign, Sun sign, and Moon sign, and a first pass through the figure is in what a birth chart is. Aspects here are named conjunction, sextile, square, trine, and opposition. Astrology on the reading page also asks for the time zone, the latitude, and the longitude. A personal reading runs the system you select and leaves that record on the page to check.

Why can one noon be a Zi month and a Capricorn Sun?

The two winter markers open on different days. Sanming Tonghui's month list labels the eleventh month, branch Zi, with Great Snow and the winter solstice together. In the chapter on the clock, the winter solstice is the mid-term of that eleventh month, the return of yang. In the chapter on seasonal terms, a sectional term stands where one branch ends and the next begins: the picture given is the end of Chou and the start of Yin. The mid-term stands at the middle of the month. Great Snow is the earlier term in Zi's pair, and the solstice, named as the mid-term, falls inside the month. Capricorn's 30 degrees open at that turn.

Noon on January 1, 2000, carries both names. In this site's solar-term table, Great Snow in 1999 falls on December 7, and Minor Cold in 2000 falls on January 6. January 1 sits between them, so the month branch is still Zi. Start of Spring in 2000 falls on February 4, so the year pillar is still the previous year. The four pillars at that noon are year Ji Mao, month Bing Zi, day Wu Wu, and hour Wu Wu. The Day Master is the day stem Wu, yang Earth. The day branch is the seventh Earthly Branch, also spelled Wu, and the hour pillar repeats Wu Wu: stem Wu beside that branch, in the Wu double-hour from 11:00 to 12:59. If your birthday falls within a day of a solar term, check that term's time in an almanac before you rely on the year pillar or the month pillar. On this noon the month branch is Zi, and Capricorn has been open since the solstice inside that month.

Which question fits BaZi, and which fits a Western chart?

Bring BaZi a question about the Day Master inside a season, and about a 10-year luck pillar: one stem and one branch stepping 10 years from the month pillar. How the starting age is counted is in what 10-year luck pillars are. A usable sentence names the Month Command, the Day Master, and the decade, then ties them to a choice you already have.

Bring the Western chart a question about the Sun's place relative to a solstice or an equinox, or about a house that needs the Ascendant. Tetrabiblos places the dominion of employment in two quarters, the Sun and the sign on the Midheaven. The houses turn with the horizon, so the birthplace belongs in the figure first.

One crossroads can use either record. Background: two roles. Options: stay, or move. BaZi takes the current 10-year pillar and the season the Day Master is in. The Western chart takes the present year, with the birthplace filled in, and how the Sun and the Midheaven describe the work. That shape is in how to turn a vague worry into a question a reading can answer. An approximate clock is covered in what birth information a reading needs.

What should you do when the two readings disagree?

Write each sentence beside the record that produced it. A Zi month speaks for the Month Command. A Capricorn Sun speaks for the 30 degrees after the winter solstice. The Day Master speaks for the day stem, and the Ascendant speaks for the eastern horizon at that place. When the suggestions diverge, compare chart, unit, and time range, as in why two readers give different answers.

Prediction and reflection separates a fact you can check from a reading of that fact. To keep a reading for two years and ask follow-up questions on the same chart, see pricing.

FAQ

Is BaZi the same thing as a Western birth chart?

No. BaZi is four pillars, eight stem-and-branch characters, the Ziping record. A Western birth chart is the ecliptic places of the Sun, the Moon, and the planets, with the Ascendant and the houses. The Siku preface keeps Wan Minying's Ziping book and his five-planet book as two titles.

Can the month branch and the Sun sign cover different spans on the same day?

Yes. At noon on January 1, 2000, the month branch is still Zi, because Minor Cold falls on January 6 in this site's table. Capricorn is the first 30 degrees after the winter solstice, and that solstice is the mid-term of the Zi month, so the sign and the branch open on different days.

What should you do when a BaZi reading and a Western reading disagree?

Keep each sentence with its own chart. Set the Month Command and the Day Master beside the sign, the house, and the time range, and check both against the choice you already wrote down.