What does Rizhu mean?

Ancient arithmetic was divided into four columns: the year column, the moon column, the sun column and the time column, and then after the Universiade, when the pattern was determined, numerology deduction could be made.

The sun column refers to the day when people representing the main branches of the lunar calendar were born. Trunks and branches are recorded every 60 days. Because months are different from leap years, trunks and branches need to find a perpetual calendar.

In horology, the sun column starts clockwise from midnight to midnight, with twelve hours as a day, and each hour accounts for two hours. The dividing line between day and day is midnight, which is eleven o'clock in the evening. Before eleven o'clock is midnight the day before, and after eleven o'clock is midnight the next day. Please pay special attention to this point, and don't think that midnight is the dividing point of the day.

Ancient arithmetic was divided into four columns: the year column, the moon column, the sun column and the time column, and then after the Universiade, when the pattern was determined, numerology deduction could be made.

Four-column algorithm /ba/b 102.htm