How to express the ancient year, month and day?

1, the way the ancients expressed the date, in addition to the common branches, there are also the forms of month and day. The way to express the date should be "the first day of the month", such as "the ninth day of September" and "the first day of October", which should be the same as today's lunar calendar.

2. Time is expressed as 24 hours every day and night, which was 12 hours in ancient times. When western mechanical clocks and watches were introduced into China, people called the time points of China and the West "Da Shi" and "Shi Shi" respectively.

3. heavenly stems and earthly branches, the main branch for short, originated from the observation of astronomical phenomena in ancient China. "A, B, C, D, E, Ji, G, Xin, Ren and Gui" are called ten heavenly stems, and "Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai" are called twelve earthly branches.

4. heavenly stems and earthly branches constitutes the ancient calendar. Ten branches and twelve branches are matched in turn to form sixty basic units, which cooperate with each other in a fixed order to form the epoch method of branches and branches. The invention of trunks and branches marked the emergence of the most primitive calendar, which was used to calculate the age by numbers.

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