Chinese astrology is the divination of the future from the Chinese calendar, which is based on astronomy, and ancient Chinese religion. In particular, it is based on the age-old sexagenary cycle of 60 years that has been documented at least since the time of the Shang Dynasty. This basic cycle has been constructed from two cycles: the 10 heavenly stems (the five elements in their yin and yang forms) and the 12 earthly branches, or the 12-year cycle of animals referred to as the Chinese zodiac. The Chinese animal zodiac also operates on a cycle of months or 'moons' and of hours of the day.
The Chinese zodiac refers to a pure calendrical cycle; there are no equivalent constellations like those of the occidental zodiac. In imperial times there were astrologers who watched the sky for heavenly omens that would predict the future of the state, but this was a quite different practice of divination from the popular present-day methods.
The ancient Chinese astronomers called the five major planets by the names of the element they were associated with: Venus corresponds to Metal (gold); Jupiter to Wood; Mercury to Water; Mars to Fire; Saturn to Earth. According to Chinese Astrology, a person's destiny can be determined by the position of the major planets, along with the positions of the Sun, Moon and comets and the person's time of birth and Zodiac Sign.
A laborious system of computing one's fate and destiny based on one's birthday and birth hours (known as Zi Wei Dou Shu ) is still used regularly in modern day Chinese astrology to divine one's fortune. The 28 Chinese constellations (xìu) are quite different from the 88 Western constellations. For example, the Big Bear (Ursa Major) is known as dǒu; the belt of Orion is known as shēn, or the "Happiness, Fortune, Longevity" trio of demigods. The seven northern constellations are referred to as xúanwǔ. Xuan Wu is also known as the spirit of the northern sky or the spirit of Water in Taoism belief.
In addition to astrological readings of the heavenly bodies, the stars in the sky form the basis of many fairy tales. For example, the Summer Triangle is the trio of the cowherd (Altair), the weaving maiden fairy (Vega), and the "tai bai" fairy (Deneb). The two forbidden lovers were separated by the silvery river (the Milky Way). Each year on the seventh day of the seventh month in the Chinese calendar, the birds form a bridge across the Milky Way. The cowherd carries their two sons (the two stars on each side of Altair) across the bridge to reunite with their fairy mother. The tai bai fairy acts as the chaperone of these two immortal lovers.