1, the chronology column is based on the chronology of the dry and branch calendars. Note that the dividing line between the previous year and the following year is based on the intersection time of beginning of spring, not on the first day of the first lunar month.
2. The moon column is based on the trunk and branch calendar. Note that the monthly trunk and branch are not based on the first day of each lunar month, but on the 12 main gas in 24 solar terms, the last month before the festival and the second month after the festival.
3. Rizhu records daily orders with dry branches. The calendars of trunks and branches are circulated once every 60 days, and trunks and branches need to find a perpetual calendar every day.
People in ancient China divided a day into twelve hours, and one hour is equivalent to two hours, so there are twelve hours in a day. A time column uses branches to represent time.