What are Shang Yuan, Zhong Yuan and Xia Yuan in Taoist magic solar terms?

Brother, a kindred spirit! ! \ r \ n \ r \ According to the theory of twenty-four solar terms, each solar term lasts fifteen days, and one section is divided into three parts, namely, upper, middle and lower, with five days each. \r\n \ r \ Calculated according to the following formula: \ r \ nYangdun: winter solstice, fright 174, slight cold 285, severe cold, vernal equinox 396, rain 963, Qingming, Changxia 4 17, beginning of spring 852, Grain Rain, etc. Yin Dun: summer solstice, Bailu 936, Xiaoshu 825, Dashu, autumnal equinox 7 14, beginning of autumn 258, Hanlu, beginning of winter 693, first snow 147, first frost, light snow 582 and heavy snow 47 1. \ r \ n \ r \ That is, on the solstice of winter, Shangyuan, who was knocked unconscious, hid one game of Yang, Zhongyuan hid seven games of Yang, and Xiayuan hid four games of Yang.