The Chinese Zodiac, known as Sheng Xiao, is based on a twelve-year cycle, each year in that cycle related to an animal sign.
These signs are the rat, ox, tiger, rabbit, dragon, snake, horse, sheep, monkey, rooster, dog and pig.
It is calculated according to Chinese lunar calendar. You can use the zodiac calculator to search for your Chinese zodiac animal sign. Select your Gregorian date of birth, and you'll reveal your date of birth according to the lunar calendar, together with your sign.
There has been a relationship between human and the 12 zodiacal animals. It is believed that the years represented by the animals affect the characters of people in the same way like the western astrology sign.