The Twenty-four Solar Terms of the Chinese Calendar and the Calculation for Them
Zhang Peiyu; Hunag Hongfeng(Purple Mountain observatory, Acadimia Sinica, 2 West Beijing Road, Nanjing, Jiansu, 210008)(Guangxi Meteorological Science Research Institute, 50 Zhiwu Road, Nanning, Guangxi, 530021)
Twenty-four solar terms (Qi) closely related to the agricultural production is an important component part of the Chinese calendar, and determined by the position of the Sun. It enables the Chinese calendar to have strong characteristics of the solar calendar. Some differences between the times of the same solar terms appear in various civil almanacs published in China recently, and confuse the readers. We analyse the cause of it here and give the method and approximate formulas about the calculation of the twenty-four solar terms.