What time is noon and the beginning of Shen?

After the Song Dynasty, each of the twelve hours was divided into two parts: the first and the second part, which were the same as the twenty-four hours of the day. In ancient China, the day was divided into 12 hours, with each hour lasting about 2 hours. This way of dividing time originated in traditional Chinese culture and played an important role in divination, agriculture and cultural activities. Each hour has a specific name and corresponding time range, such as Zi: 23:00~1:00, U 1:00~3:00, C: 3:00~5:00, D: 5:00~7:00, C: 7:00~9:00, S: 9:00~11:00, W: 11:00~13:00, W: 13:00~15:00, Shen: 15:00~ 17:00, You; 17:00~19:00, Xu: 19:00~21:00, Hai: 21:00~23:00. This system of hours reflects the ancient people's precise conception of time and the importance they attached to it, as well as the unique understanding of time in traditional Chinese culture.