2. Wu Si: The chronology of trunk and branch is a kind of chronology in ancient China;
3. heavenly stems and earthly branches, the main branch for short, originated from the observation of astronomical phenomena in ancient China. Ten dry words: encounter, enlightenment, gentleness, firmness, harmony, Tu Youyou, shangzhang, heavy light, mystery and sunshine. Twelve branches said: sleepy, red heart, taking photos, single-handedly, Xu Bao, Yeluo, Dunyi, Qitan, Dayuanxian.
Extended data:
Heavenly stems and earthly branches introduced:
The 60th day of a year is roughly a cycle of two months; Reuse after a cycle, cycle after cycle, cycle. According to the confirmed literature, the date of the year of trunk and branch began in February of the third year of the Luyin Gregorian calendar ("there is food every day", which was converted to February 22, 720 BC in the fifty-first year of Zhou Pingwang).
Heavenly stems and earthly branches is one of the ancient traditional cultures of the Chinese nation. There are ten characters in heavenly stems, and the order is A, B, C, D, E, G, Xin, Ren and Gui, while there are twelve characters in earthly branches, and the order is Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen and You.
Baidu Encyclopedia-heavenly stems and earthly branches