The Chinese calendar, also known as the lunar calendar, is used to determine important festival dates and astrological events in Chinese culture. Synonyms for the Chinese calendar include the traditional Chinese calendar, the lunar or lunisolar calendar, the farmer's calendar, and the yin calendar. This calendar is based on the cycles of the moon and the sun, with months consisting of 29 or 30 days. Each Chinese year is represented by one of the twelve animals of the Chinese zodiac, with each animal corresponding to a different set of personality traits. The Chinese calendar has been used for over 4,000 years and remains an important aspect of Chinese culture today.