Are Saju and Bazi the same thing?

Saju (사주) and Bazi (八字) share the same Four Pillars framework: 10 Heavenly Stems × 12 Earthly Branches across four time-pillars (year, month, day, hour). The structural mathematics is identical. Differences are in calendar conventions (Korean tradition often uses Korea Standard Time KST and Korean solar terms; mainland Chinese tradition uses China Standard Time CST), hour-block boundaries, and interpretation lineages (Korean Myeongri-hak vs Chinese Ziping schools).

Does Saju use lunar or solar calendar?

Korean Saju uses the solar-term calendar (절기), not the simple lunar calendar. The year boundary is at Ipchun (입춘, around February 4), the month boundary is at each major solar term. This is the same convention used in Chinese Bazi. Common confusion: 'lunar new year' (e.g., Seollal) is the cultural lunar calendar, not the Saju calendar boundary.

Why do Korean and Chinese readings of the same birth differ?

Three reasons: (1) timezone — China uses a single CST timezone while historical Korean tradition often computed local solar time for the place of birth; (2) hour-block conventions differ slightly across schools (Ziping, Mang Pai, Bazhongguan, Korean Myeongri); (3) interpretation lineage — Korean tradition emphasizes Day Master strength and Yong Shin (용신, useful god), while some Chinese schools weight hidden stems and Na Yin (납음) differently.

Which is more accurate, Saju or Bazi?

They are the same framework. Accuracy depends on the reader and the depth of analysis, not on whether the label is Korean or Chinese. Cheonmyeongdang uses a Korean Myeongri interpretation lineage with explicit hour-boundary configuration for the user's birth location.

Can a Korean Saju app read my Chinese Bazi chart correctly?

Yes - the four pillars compute identically from a Gregorian birth date + time + timezone. Cheonmyeongdang lets you input any global birth location and applies the appropriate timezone, then presents the chart in Korean Myeongri format. The raw four pillars match any reputable Chinese Bazi calculator.

Saju vs Chinese Bazi: Same Four Pillars, Different Calendars

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KunStudio Saju Research Team · K-Wisdom Comparison Series · Published 2026-05-27

Quick answer: Saju (사주, Korean) and Bazi (八字, Chinese) are the same Four Pillars framework - identical math. They differ in (1) timezone conventions (Korea KST vs China CST), (2) hour-block boundaries across schools, and (3) interpretation lineage (Korean Myeongri-hak vs Chinese Ziping). Same chart, different reading style.

Side by side

Dimension	Korean Saju (사주)	Chinese Bazi (八字)
Literal meaning	"Four Pillars"	"Eight Characters" (2 chars × 4 pillars)
Origin	Adapted from Chinese Bazi, Goryeo dynasty+	Tang dynasty (~618 CE), systematized in Song
Calendar boundary	Solar terms (절기), year starts at Ipchun	Solar terms (节气), year starts at Lichun
Timezone convention	KST or local solar time of birth city	CST single timezone (mainland)
Hour-block start	Ja-shi 자시 = 23:30-01:30 (Korean Myeongri)	Zi-shi 子时 = 23:00-01:00 (Ziping)
Primary school	Myeongri-hak (명리학)	Ziping (子平), Mang Pai (盲派), Bazhongguan
Emphasis	Day Master strength, Yong Shin (용신)	Stem-Branch interactions, Na Yin (납음)
Cultural use	Marriage Gunghap, naming, business open dates	Wedding dates, feng shui, fortune-telling

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The shared foundation

Both Saju and Bazi use the sexagenary cycle - 10 Heavenly Stems (天干: 甲乙丙丁戊己庚辛壬癸) paired with 12 Earthly Branches (地支: 子丑寅卯辰巳午未申酉戌亥) into 60 unique combinations. Each of the four pillars (year, month, day, hour) of a birth takes one Stem-Branch pair. Both systems treat the Day Master (Korean: 일간, Chinese: 日干) as the core. Both use the Five Elements (Wood, Fire, Earth, Metal, Water) and the Ten Gods (Korean: 십신, Chinese: 十神) interpretive framework.

This means a chart computed correctly in one system matches the other digit-for-digit. The 60-year cycle, the solar-term boundaries, and the Stem-Branch math are shared cultural property across East Asia - Korea, China, Japan, Vietnam all use variants.

Difference 1: timezone conventions

This is the biggest source of discrepancy between a Korean and a Chinese reading of the same birth. Mainland China uses a single timezone (CST, UTC+8) covering five geographic time zones. A person born at 23:30 local sun time in western China shows up in CST as a different hour than their actual solar position. Korean Myeongri tradition more often uses the local solar time of the birth city - or at minimum KST adjusted for the East Asia mean.

Example: a person born in Urumqi (西安 actual solar lag ~+1.5 hours) on 1990-06-15 at 23:30 CST might fall into a different Hour pillar depending on which convention is applied. Korean readers typically apply local solar correction. Chinese readers often use CST as-recorded. Same birth, different Hour pillar, different reading. Reddit r/Bazi has multiple threads where this discrepancy confuses cross-cultural users.

Difference 2: hour-block boundaries

The 24-hour day is divided into 12 two-hour blocks (시진 / 时辰), each named for one of the Earthly Branches. The disagreement is where Ja-shi (자시 / 子时) starts.

Korean Myeongri: Ja-shi spans 23:30 to 01:30. A birth at 23:45 takes the next day's date pillar.
Chinese Ziping: Zi-shi spans 23:00 to 01:00. A birth at 23:15 already takes the next day's date pillar.
Some modern Chinese schools: Use 24-hour Zi (24:00 boundary) - the cleanest mathematically but uncommon in traditional practice.

For births within 30 minutes of midnight this can change Day pillar AND Day Master - the most consequential difference in any Four Pillars reading.

Get a chart with explicit hour-boundary setting

Cheonmyeongdang lets you choose Korean (23:30) or Chinese (23:00) Ja-shi convention.

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Difference 3: interpretation lineage

The same chart can be read differently depending on school. Korean Myeongri-hak emphasizes:

Day Master strength assessment - is the Day Master rooted, supported, or weak?
Yong Shin (용신, useful god) - the single most needed element to balance the chart
Daewoon flow - how 10-year cycles interact with the Yong Shin

Chinese Ziping (子平派) and Mang Pai (盲派) traditions weight differently:

Stem-Branch combinations and clashes at fine detail (合, 冲, 刑, 害)
Na Yin (纳音) - the sound element mapping, used in some Mang Pai readings
Hidden Stems within the Earthly Branches, weighted heavily

Neither lineage is "more correct" - they ask different questions of the same chart.

Cultural use diverges too

In Korea, Saju is overwhelmingly used for: marriage Gunghap (궁합), naming newborns (작명), business opening dates (개업일 택일), and personal annual forecasts (신년운세). The Korean astrology and fortune-telling market is estimated at KRW 3.7 trillion (USD 2.8B) annually.

In China, Bazi is paired with feng shui (풍수) for housing and grave selection, and with face-reading (관상 / 面相) for character assessment. Wedding date selection and business launches also draw on Bazi. Politically the practice is less openly mainstream than in Korea but remains widely consulted privately.

Which should you use?

You are in or culturally close to Korea / want marriage Gunghap → Korean Saju.
You are in or culturally close to China / using Bazi alongside feng shui → Chinese Bazi.
You want the chart but flexibility in interpretation → use a tool that lets you toggle hour-boundary convention.

Free chart with timezone + hour-boundary controls

9-language Four Pillars at sajuapp.app · Android app on Play Store.

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FAQ

Does Cheonmyeongdang follow Korean or Chinese convention?

Default: Korean Myeongri (23:30 Ja-shi, local-solar time correction). User-configurable to Chinese Ziping (23:00 Zi-shi, single timezone).

What if I was born in a country that is neither Korea nor China?

The math still works. We apply the timezone of your birth city and convert to the relevant hour-block. Vietnamese, Japanese, and overseas-Korean users frequently use the system.

Is one system "more authentic" than the other?

Both lineages have over 1,000 years of textual tradition. Authenticity is not the right axis - cultural fit and interpretation depth are.

Disclaimer: Cultural and entertainment content only. Korean Saju and Chinese Bazi are both classified as non-YMYL entertainment under Google's 2025 Search Quality Rater Guidelines. Nothing in this article is medical, legal, financial, or psychiatric advice.

Sources cited (verified 2026-05-27):