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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 Suixing (Jupiter, the Year Star). Astronomers rounded the orbit of Suixing to 12 years (from 11.86). Suixing was associated with Sheti (ɳ Böotes) and sometimes called Sheti.

In correlative thinking, the twelve years of the Jupiter cycle also identify the twelve months of the year, twelve animals ( Mnemonic s for the system), directions, seasons, months, and Chinese Hour in the form of double-hours. When a Branch is used for the exact time of a day, the listed hours are used. When used for a period, it means a period from one hour before to one hour after. 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, not the Weather . 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
Chinese
name
Japanese
name (On and Kun)
Korean
name
Vietnamese
name
Chinese
zodiac
Direction Season Lunar Month Hour
1 shi
ne
tý (Tí) Rat
(north)
winterMonth 11
( Winter Solstice )
11pm to 1am
(midnight)
2 chǒuchu
ushi
sửu Ox 30°Month 121am to 3am
3 yínin
tora
dần Tiger 60°springMonth 13am to 5am
4 mǎobou
u
mão (mẹo) Rabbit 90°
(east)
Month 2
( Vernal Equinox )
5am to 7am
5 chénshin
tatsu
thìn Dragon 120°Month 37am to 9 am
6 mi tỵ Snake 150°summerMonth 49am to 11am
7 uma ngọ Horse 180°
(south)
Month 5
( Summer Solstice )
11am to 1pm
(noon)
8 wèimi
hitsuji
mùi Sheep 210°Month 61pm to 3pm
9 shēnsaru thân Monkey 240°autumnMonth 73pm to 5pm
10 yǒutori dậu Rooster 270°
(west)
Month 8
( Autumnal Equinox )
5pm to 7pm
11 jutsu
inu
tuất Dog 300°Month 97pm to 9pm
12 hàigai
i
hợi Pig 330°winterMonth 109pm to 11pm


Some cultures assign different animals: the second animal is the Water Buffalo in Vietnam , the fourth is the Cat in Vietnam and Thailand , and the twelfth is the Wild Boar in Japan .


DIRECTIONS


Even though Chinese has words for the four Cardinal Direction s - 北 (běi, north), 東 (dōng, east), 南 (nán, south), and 西 (xī, west) - Chinese Mariners and Astronomer s 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:

  • For the four diagonal directions, appropriate trigram names of I Ching were used.

  • For the rest, the Heavenly Stems were used. According to the Five Elements theory, east is assigned to wood, and the Stems of wood are 甲 (jiǎ) and 乙 (yǐ). Thus they were assigned clockwise to the two adjacent points of the east.


Following is a table of the 24 directions:

























































































































































  Character Chinese
name
Japanese
name
Direction
1 ne
(north)
2 guǐmizunoto 15°
3 chǒuushi 30°
4 gènushitora 45°
(northeast)
5 yíntora 60°
6 jiǎkinoe 75°
7 mǎou 90°
(east)
8 kinoto 105°
9 chéntatsu 120°
10 xùntatsumi 135°
(southeast)
11 mi 150°
12 bǐnghinoe 165°
13 uma 180°
(south)
14 dīnghinoto 195°
15 wèihitsuji 210°
16 kūnhitsujisaru 225°
(southwest)
17 shēnsaru 240°
18 gēngkanoe 255°
19 yǒutori 270°
(west)
20 xīnkanoto 285°
21 inu 300°
22 qiáninui 315°
(northwest)
23 hàii 330°
24 rénmizunoe 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°.


SEE ALSO