Jiazi Xin Chou year. According to the official website of the Perpetual Calendar, we learned that New Year’s Day in 2021 is the year of Jiazi Xinchou. In the traditional Chinese stem and branch calendar, the first year of a sixty-year-old is called the "Jiazi year". As far as the Chinese lunar calendar and timekeeping are concerned, China has twenty-four solar terms, and the Chinese lunar calendar is formulated based on the rotation of the earth. That is to say, based on the moon's waxing and waning cycle around the earth, it takes a month for the moon to go from waning to full, and then from full to waning.