八卦
Ba Gua · Eight Trigrams & Yi Jing

The eight trigrams, Later Heaven arrangement and 64 hexagrams.

Eight Trigrams 八卦 (D.1)
The Ba Gua (Eight Trigrams) form the foundation of the Yi Jing (I Ching). Each trigram is made of three lines — solid (Yang ━) or broken (Yin - -) — representing cosmic forces, directions, family members, and natural phenomena. The Later Heaven arrangement (後天八卦) by King Wen is used in Feng Shui; the Former Heaven (先天八卦) by Fu Xi for divination.
TrigramSymbolChinesePinyinElement Direction (Later Heaven)NumberFamilyNature Image
☰乾乾Qián Metal 金NW6Father 父Heaven 天
☷坤坤Kūn Earth 土SW2Mother 母Earth 地
☳震震Zhèn Wood 木E3Eldest Son 長男Thunder 雷
☴巽巽Xùn Wood 木SE4Eldest Daughter 長女Wind 風
☵坎坎Kǎn Water 水N1Middle Son 中男Water 水
☲離離Lí Fire 火S9Middle Daughter 中女Fire 火
☶艮艮Gèn Earth 土NE8Youngest Son 少男Mountain 山
☱兌兌Duì Metal 金W7Youngest Daughter 少女Lake 澤
Later Heaven Arrangement 後天八卦 (King Wen · D.2)
The Later Heaven (King Wen) arrangement maps trigrams to compass directions and is used in all Feng Shui applications. South is at top, North at bottom — the traditional Chinese map orientation.
☴
巽 SE
4 · Wood
☲
離 S
9 · Fire
☷
坤 SW
2 · Earth
☳
震 E
3 · Wood
五
Centre
5 · Earth
☱
兌 W
7 · Metal
☶
艮 NE
8 · Earth
☵
坎 N
1 · Water
☰
乾 NW
6 · Metal

South at top · North at bottom · as in traditional Chinese cartography

Life Gua 命卦 — Personal Trigram Number (D.3)
The Life Gua (命卦) is derived from birth year and gender. It determines a person's auspicious and inauspicious directions, and divides people into East Group (東命 Gua 1,3,4,9) or West Group (西命 Gua 2,6,7,8).
MALE 男 — How to Calculate

1. Add the last two digits of birth year until a single digit.
2. Subtract from 10 (if born 2000 or later, subtract from 9).
3. If result = 5, use Gua 2 (坤) for males.

FEMALE 女 — How to Calculate

1. Add the last two digits of birth year until a single digit.
2. Add 5 (if born 2000 or later, add 6).
3. Reduce to single digit. If result = 5, use Gua 8 (艮) for females.

64 Hexagrams 六十四卦 (D.4) — Quick Reference Grid