The Principle of Song Formula with Corner Left in Yin Wu

Do you want to ask what is the principle of the song "I can't make a call"? The musical principle of the Preface of Jiao Su Bu Yin Wu is the Chronology of Sixty Jiazi. This is an ancient 60-year-old chronology, which has a rhyme: Jiazi is hollow in ten days, Jiazi is hollow in ten days; In central Wu Jia, Tatsumi is empty, and in central Chen Jia, it is also empty; Shen Jia is not free at noon, and Jiayin is ugly at noon. This song means that according to the above rules, every ten days are divided into years, months, days and hours. In the prediction of six hexagrams, the sky is unique, and the sky in the hexagrams is determined by the sun at the middle of the four seasons.