Party A, Party B, Party C, Party D, Party E, Party B, Party G, Party A, Party B, Party B and Party B are classified into ten branches, which are symbols used to indicate the order in ancient China, and the twelve branches are used to calculate the time.
Tiangan began in Shang Dynasty at the latest. The obvious evidence is that the titles of Shang leaders are Shangjia, B, C, D, Zhu Ren and Zhu Gui. Officially naming these ten symbols as heavenly stems should be related to earthly branches: the stem is the main stem and the branch is the branch. These two relative names should appear together. In Shang Dynasty, heavenly stems and earthly branches began to cooperate in keeping records of the day, and it was later that the year was recorded with earth branches.
Decimal system is used in the sky trunk, which is convenient for intuitive calculation, and decimal system is used in the ground branch, which has advantages in recording time and month. Heavenly stems and earthly branches combination is sexagesimal, which is suitable for closely spaced (dates), so don't confuse (dates). In ancient China, heavenly stems and earthly branches combination was used flexibly to express year, month, day and time, so the so-called birthday appeared.
The relationship between ten heavenly stems and Beidou
1, dou refers to the east, divination refers to earthquake, heavenly stems and earthly branches, and the five elements belong to wood, which is in mid-spring. At the right time, everything came out and was full of vitality.
2, the fight is divided into the south, the elephant is divided, the sky is dry, the ground is noon, and the five elements are fire, and it is summer. At the right time, everything grows with great potential.
3. Fighting in the west is like an exchange. The sky is dry in Geng Xin, and the land is unitary. The five elements belong to gold, and it is the Mid-Autumn Festival. At the right time, everything was bumper and the weather was cold.
4, the bucket refers to the north, like a ridge, the sky is dry, the ground is scorpion, the five elements belong to water, and it is winter. At that time, everything was hidden and never met.
The above contents refer to Baidu Encyclopedia-Tiangan