1. Time issue
In ancient China, a day was divided into 12 shichen, each corresponding to 2 hours. Therefore, when arranging horoscopes, the horoscopes for any 2-hour interval within the range are the same, and do not need to be very precise. (For example, the horoscopes generated between 5:00 and 7:00 are the same.)
The hours are as follows: 23:00–01:00 (Zi Shi), 01:00–03:00 (Chou Shi), 03:00–05:00 (Yin Shi), 05:00–07:00 (Mao Shi), 07:00–09:00 (Chen Shi), 09:00–11:00 (Si Shi), 11:00–13:00 (Wu Shi), 13:00–15:00 (Shen Shi), 15:00–17:00 (You Shi), 17:00–19:00 (You Shi), 19:00–21:00 (Xu Shi), and 21:00–23:00 (Hai Shi)
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