Origins of the Chinese Zodiac

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The twelve animals of Chinese astrology:
Rat	Ox
Tiger	Rabbit
Dragon	Snake
Horse	Sheep
Monkey	Rooster
Dog	Pig

According to one legend, in the sixth century B.C. the Jade Emperor invited all the animals in creation to a race, only twelve showed up: the Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Lamb, Monkey, Cock, Dog, and Pig, and according to their places in the race, the Jade Emperor had given them each a number starting with the Rat who was the winner of the race.

Many legends arose from the Race of the Chinese Zodiacs. One told of the reason why cats and rats shall always be enemies: He and the cat (at the time good friends) were poor swimmers, so they asked the ox if they could stay on top of his head to cross the river. Along the way he pushed the cat off of the ox's back. And the cat, incapable of swimming, lagged behind. The rat stayed on top of the ox's head until the ox was almost at the finish line. And as the ox was about to cross it, the rat jumped from the ox's head and became first place. And the cat and rat have been enemies ever since.

Another legends tells that the cat had asked the rat to wake him up the day of the Race. The rat agreed, but on the said day, he did not wake the cat in his greed to win. When the cat finally woke up and got to the racing ground, he found the race to be over. The cat then swore revenge upon the rat.

The legend of the Zodiac Race, of course, is by far the least credible of all explanations of the origin of the Chinese zodiac. Because the "twelve earthly branches" which correspond with the zodiac, was already in existence as early as the Zhou era, long before the advent of Buddhism. A parallel decimal set of symbols called "ten heavenly stems", corresponding with yin-yang dualism and the five elements (wood, fire, earth, metal, water) was in existence in the Shang dynasty as the stems were part of Shang rulers' names. The Zodiac, or the "twelve earthly branches" is probably devised together with the ten heavenly stems.

(According to Derek Walters, British scholar and author of several related books, there is no historical evidence for the 12 animals correlation with the Earthly Branches prior to the late Tang / early Song eras.)

As a duodecimal numeral system, the twelve earthly branches is probably evidence for trade between early tribes that later contributed to the Chinese civilization on the one hand, and the Mesopotamian civilization, which perfected duodecimal arithmetics, on the other.

The Chinese zodiac, though not entirely identical with the Greek zodiac, nonetheless shares with it the duodecimal system and the idea of using animals as numerical symbols. This is a hint for the triangular relations between early Chinese, Mesopotamian and Greek cultures.

When the Bulgars, an early Turkic tribe within the Hun tribal federation that invaded Europe at the end of the Roman Empire, brought with them the very same Chinese zodiac. This is a probability that the Chinese zodiac is of northern Chinese origin, commonly shared among Altaic and northern Chinese tribes.

However, nowadays the Thai and Tibetans use the same zodiac with slight modification, probably due to millennia of contact with the Chinese civilization.