What does Ding Jishi mean?

Ding is the sixth hour of twelve hours, which means near noon, also called the corner, which means from nine to eleven in the morning. Twelve o'clock was summed up by the ancients according to the appearance and appearance of the sun, the change of the sky and the natural laws of their daily production activities and living habits.

"D 4" is one of the main branches, and the order is 54. The former is Chen Bing, and the latter is the 54th year in the traditional calendar of China. In the following calendar year, if the number of years is divided by more than 60 and 57, or if the number of years is reduced by 3, the remainder divided by 10 is 4, and the remainder divided by 12 is 6. The years from the first day of the first month of that year to the New Year's Eve of the following year are all "Ding Si years".