What was the astronomical calendar of the ancient Western Regions? Why is advanced surprising?

Calendar is very important to a country and a nation. Calendar can guide the development of agriculture, determine solar terms and promote economic development. Each region has its own astronomical calendar. A piece of calendar fragment was found in Turpan, Xinjiang, an ancient western country in China. They are determined by astrology. In the field of astronomy, the astronomical calendars of ancient western countries are very advanced.

First, at that time, the application of celestial bodies was not developed in the general field of local astronomy, and the general force method used relatively large celestial bodies to name and formulate calendars. For example, the new moon, a relatively large celestial body, is the main reference for people to determine the calendar. However, the calendar of the ancient western regions was indeed named and referenced by the Pleiades star cluster, a relatively small celestial body. The Pleiades star cluster was rarely written into the literature, so it was very unknown, and the ancient western regions were named after it. It's hard to say that the ancient western regions have high attainments in the development of astronomy, and they can use and refer to some unknown celestial bodies to complete important astronomical calendars, and they can also see their confidence in the study of astronomical calendars.

Second, China's unique exploration of the calendar in history refers to the calendar of the Central Plains or directly brings it to the past for direct use. The ancient western countries did not follow the mainstream, nor did they use the calendar of the Central Plains. Instead, they created their own calendars, not afraid of any trouble and failure. Through their own research to complete the calendar, the economy and culture of the ancient western regions are not as developed as that of the Central Plains, so there are bound to be difficulties in research. However, they can create a Pleiades calendar that is different from the new calendar, and the research on celestial bodies is more difficult than the new calendar, and the calendar created is more advanced and more in line with the local actual situation.

Calendar is the key to keep time in ancient times and the basis to guide people's daily production and life. The Pleiades calendar created by ancient countries in the western regions, through the study of relatively small celestial bodies, has created a calendar that conforms to its own local reality, and the study of celestial bodies in the calendar is even more advanced, making contributions to the future development of astronomy.