Chinese New Year, also known as Lunar Festival, is the most important Chinese holiday. It is defined as the first day of the first month in the traditional Chinese calendar. The New Year calendar, which is based on a solar calendar, which is based on the solar calendar, the dates are both the phase of the moon and the time of the solar year. In addition, there is a flat month around two days shorter than a solar month. As such, in order to "catch up" with the solar calendar, an extra month is inserted every few years. This is why, according to the solar calendar, the Chinese falls are a different date each year.