The Earthly Branches (Chinese: 地支; pinyin: dìzhī; or Chinese: 十二支; pinyin: shí'èrzhī; literally "twelve branches"; or Korean:십이지) provide one Chinese system for reckoning time.
This system was built from observations of the orbit of Jupiter. Chinese astronomers divided the celestial circle into 12 sections to follow the orbit of 歳星 Suìxīng (Jupiter, the Year Star). Astronomers rounded the orbit of Suixing to 12 years (from 11.86). Suixing was associated with 攝提 Shètí (η Boötis) and sometimes called Sheti.
In correlative thinking, the twelve years of the Jupiter cycle also identify the twelve months of the year, twelve animals (mnemonics for the system), directions, seasons, months, and Chinese hour in the form of double-hours. When a Branch is used for a double hour, the listed periods are meant. When used for an exact time of a day, it is the center of the period. For instance, 午 (the Horse) means noon or a period from 11am to 1pm. (The jie qi system provided single hours and 15-degree arcs in time and space.)
Chinese seasons are based on observations of the sun and stars. Many Chinese calendrical systems have started the new year on the first new moon after the winter solstice.
The Earthly Branches are today used with the Heavenly Stems in the current version of the "traditional calendar" and in Taoism. The Ganzhi (Stem-Branch) combination is a fairly new way to mark time; in the Shang era it was the ten Heavenly Stems that provided the names of the days of the week. The Branches are as old as the Stems (and according to recent archaeology may actually be older), but the Stems were tied to the ritual calendars of Chinese kings. They were not part of the calendrical systems of the majority of Chinese.
| Earthly Branch |
Mandarin name |
Japanese name | Korean name |
Vietnamese name |
Chinese zodiac |
Direction | Season | Lunar Month | Double Hour | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| On | Kun | ||||||||||
| 1 | 子 | zǐ | し(shi) | ね(ne) | 자 (ja) | tý (Tí) | Rat | 0° (north) | winter | Month 11 | 11pm to 1am (midnight) |
| 2 | 丑 | chǒu | ちゅう(chū) | うし(ushi) | 축 (chuk) | sửu | Ox | 30° | Month 12 | 1am to 3am | |
| 3 | 寅 | yín | いん(in) | とら(tora) | 인 (in) | dần | Tiger | 60° | spring | Month 1 | 3am to 5am |
| 4 | 卯 | mǎo | ぼう(bō) | う(u) | 묘 (myo) | mão (mẹo) | Rabbit | 90° (east) | Month 2 | 5am to 7am | |
| 5 | 辰 | chén | しん(shin) | たつ(tatsu) | 진 (jin) | thìn | Dragon | 120° | Month 3 | 7am to 9 am | |
| 6 | 巳 | sì | し(shi) | み(mi) | 사 (sa) | tỵ | Snake | 150° | summer | Month 4 | 9am to 11am |
| 7 | 午 | wǔ | ご(go) | うま(uma) | 오 (o) | ngọ | Horse | 180° (south) | Month 5 | 11am to 1pm (noon) | |
| 8 | 未 | wèi | び(bi) | ひつじ(hitsuji) | 미 (mi) | mùi | Goat | 210° | Month 6 | 1pm to 3pm | |
| 9 | 申 | shēn | しん(shin) | さる(saru) | 신 (sin) | thân | Monkey | 240° | autumn | Month 7 | 3pm to 5pm |
| 10 | 酉 | yǒu | ゆう(yū) | とり(tori) | 유 (yu) | dậu | Rooster | 270° (west) | Month 8 | 5pm to 7pm | |
| 11 | 戌 | xū | じゅつ(jutsu) | いぬ(inu) | 술 (sul) | tuất | Dog | 300° | Month 9 | 7pm to 9pm | |
| 12 | 亥 | hài | がい(gai) | い(i) | 해 (hae) | hợi | Pig | 330° | winter | Month 10 | 9pm to 11pm |
Some cultures assign different animals: Vietnam replaces the ox, rabbit, and sheep with the water buffalo, cat, and goat respectively; Japan replaces the pig with the wild boar; Tibet replaces the rat, ox, rabbit and rooster with the mouse, bull, hare and bird respectively. In the traditional Kazakh version of the 12-year animal cycle (Kazakh: мүшел, müşel), the dragon is substituted by a snail (Kazakh: ұлу, ulw), and the tiger appears as a leopard (Kazakh: барыс, barıs).[1]
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Even though Chinese has words for the four cardinal directions - 北 (běi, north), 東/东 (dōng, east), 南 (nán, south), and 西 (xī, west) - Chinese mariners and astronomers/astrologers preferred using the twelve directions of the Earthly Branches, which is somewhat similar to the modern-day practice of English-speaking pilots using o'clock for directions. Since twelve points were not enough for sailing, twelve midpoints were added. Instead of combining two adjacent direction names, they assigned new names as follows:
Following is a table of the 24 directions:
| Character | Mandarin name | Japanese name | Direction | |
|---|---|---|---|---|
| 1 | 子 | zǐ | ne | 0° (north) |
| 2 | 癸 | guǐ | mizunoto | 15° |
| 3 | 丑 | chǒu | ushi | 30° |
| 4 | 艮 | gèn | ushitora | 45° (northeast) |
| 5 | 寅 | yín | tora | 60° |
| 6 | 甲 | jiǎ | kinoe | 75° |
| 7 | 卯 | mǎo | u | 90° (east) |
| 8 | 乙 | yǐ | kinoto | 105° |
| 9 | 辰 | chén | tatsu | 120° |
| 10 | 巽 | xùn | tatsumi | 135° (southeast) |
| 11 | 巳 | sì | mi | 150° |
| 12 | 丙 | bǐng | hinoe | 165° |
| 13 | 午 | wǔ | uma | 180° (south) |
| 14 | 丁 | dīng | hinoto | 195° |
| 15 | 未 | wèi | hitsuji | 210° |
| 16 | 坤 | kūn | hitsujisaru | 225° (southwest) |
| 17 | 申 | shēn | saru | 240° |
| 18 | 庚 | gēng | kanoe | 255° |
| 19 | 酉 | yǒu | tori | 270° (west) |
| 20 | 辛 | xīn | kanoto | 285° |
| 21 | 戌 | xū | inu | 300° |
| 22 | 乾 | qián | inui | 315° (northwest) |
| 23 | 亥 | hài | i | 330° |
| 24 | 壬 | rén | mizunoe | 345° |
Advanced mariners such as Zhèng Hé used 48-point compasses. An additional midpoint was called by a combination of its two closest basic directions, such as 丙午 (bǐngwǔ) for the direction of 172.5°, the midpoint between 丙 (bǐng), 165°, and 午 (wǔ), 180°.
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