The Relationship between Sanyuan and Twenty-eight Houses and Seven Houses

I want to talk about my understanding: Three Walls, Four Elephants and Twenty-eight Nights were formulated by China in ancient times for the convenience of studying the starry sky and mastering the laws of the moon's motion. To put it simply (in fact, this is not simple), the three walls are Wei Zi Wall (the center of the northern sky), Taiwei Wall (the northeast of Wei Zi) and Shi Tian Wall (the southeast of Wei Zi), all of which are located at the North Celestial Pole (as for the three constellations, you can search Baidu, but there is no).

In order to observe the movement of the moon, the ancients divided the stars near the ecliptic and the white road into four elephants, which circled the sky respectively, namely, the East Black Dragon, the South Suzaku, the West White Tiger and the North Xuanwu. Each elephant is divided into seven sections, called "lodging", and * * * counts as 28 lodging (as for what star to lodge, it is Baidu itself, not much to say). The moon moves eastward along the white road and stays at one o'clock every day.

Due to long-term observation, the ancients found five unusual stars in the sky, namely, Chenmercury, Taibai-Venus, Huo Ying-Mars, Nian-Jupiter, and True Saturn, and they are also called the Sun and Lunar.

Having said all this, we actually want to draw out a large area around the North Celestial Pole with three walls. Four elephants stay near the ecliptic, and seven nights are the sun, the moon and five planets. We see them moving on the ecliptic. As mentioned above, they constitute the northern sky that we are familiar with with with the naked eye. That's it. My expressive ability is not very strong. I don't know if you can understand. I hope you are satisfied.