Tibetan Calendar is a traditional calendar widely used in Tibet. According to history, a unique calendar which is used to calculate day, month, and year according to wax and wane of the moon, was created by Tibetan people more than 3,000 years ago. Hundreds of years later, those who believe in Bonpo (the original religion in Tibet) learn to reckon the exact day of Winter Solstice and made it the beginning of a year. This laid the foundation of the variety of festivals in Tibet. In the 7th century, Princess Wen Cheng and Princess Jin Cheng entered Lhasa Tibet for marriage successively and took Chinese Traditional Calendar to this ancient land. From then on, the Tibetan Calendar had taken advantage of the lunar calendar and the Hindu calendar. It became an individual calendar which contains Heavenly Stems, Earthly Branches, and the five elements in the Yuan Dynasty. After centuries of development, the Tibetan Calendar has become a mature system.