What year does it refer to?

Unclear years refer to 1523, 1583, 1643, 1703, 1763, 1823, 1883. In 2363, 2423, 2483, 2543, 2603, 2663, 2723, 2783, 2843, 1903, 1963.

The 20th year in a cycle of the China lunar calendar is called "the last year of Guiwei". In every AD year, if the number of years is divided by more than 60 and 23, or the number of years is subtracted by 3, the remainder of division by 10 is 0, and the remainder of division by 12 is 8. The years from beginning of spring to beginning of spring the following year are "outstanding years".

Tree trunk and branch chronology algorithm

The chronology of cadres and branches starts from beginning of spring in the twenty-four solar terms, because it is the chronology method of the calendar of cadres and branches. The same is true of the official almanac of past dynasties (that is, the Yellow Calendar).

Since the Republic of China, the lunar calendar has only used branches to record the year, which ranges from the first day of the first month to New Year's Eve, which is indisputable. Lunar calendar and trunk calendar are two different calendars, which are different in the starting point of a year, the division rules of months and the number of days in each year.