The Chinese lunar calendar (also called the agricultural calendar) is based on the cycles of the moon and sun. It has been used for thousands of years to determine traditional Chinese holidays and auspicious dates for important events. Each year is associated with one of 12 zodiac animals and one of 5 elements, creating a 60-year cycle. The lunar months typically begin on the new moon, with the full moon falling around the 15th day. Leap months are occasionally added to keep the calendar aligned with the solar year.