Ziwei is the Big Dipper.

In ancient times, people studied the Big Dipper, especially in the eyes of emperors, the change of the Big Dipper was very important. By observing the Big Dipper, people can better carry out agricultural and animal husbandry production, and at the same time, the Big Dipper can also let people observe the corresponding climate change. It can be said that the Big Dipper is very important in the eyes of the ancients and has an inseparable relationship with daily life.

First of all, the Big Dipper can help the ancients to identify their directions, and it has existed for a long time, and it can be seen almost all year round, and people can easily identify it. Generally speaking, the position of the Big Dipper refers to the North Star, and we all know that its direction is always the north, so this is also a common way for the ancients to identify the direction at night. For example, when lost in the wild, the ancients could correctly identify the direction according to the Big Dipper.

Secondly, in ancient times, Polaris was also called purple MSI. Especially in the eyes of some emperors, purple MSI is very important. Some people even think that Zixing is the emperor star, which makes the Big Dipper more and more mysterious. Because MSI is located in the north, and at the same time, in ancient times, the north was more developed than the south in any way, and it was better in the war. Therefore, over time, the ancients will think that the purple star is the star representing the emperor, and the Big Dipper has a very important position and significance in the emperor's culture.

Finally, the Big Dipper is also related to climate change. People can determine the time to plant crops and raise animals according to the changes of the Big Dipper. The ancients were also very clever. Through long-term research, it is found that when the bucket handle of the Big Dipper points to the east, it means spring, and when bucket handle points to the south, it means summer. At the same time, the ancients also formulated 24 solar terms according to the changes of the Big Dipper to help people grow crops better.