What do you mean, six, seventy-two

Six months and 72 days, right? In ancient times, a year was calculated according to 360 days (like 360 degrees now). Five days of people and things are first-class, six days of January is first-class, and six months are exactly counted as January. The twenty-four solar terms in a year are exactly twelve hexagrams, that is, twelve news hexagrams, and then the changes of people and things in the world are calculated according to this news hexagram.