In the history of China, there are many great scientists and their outstanding contributions. Among them, Yuan Tiangang and his "Dayan Calendar" are a typical example. "Dayan Calendar" is the earliest calendar independently completed by an individual in Chinese history. Its formulation marked a major breakthrough in ancient Chinese astronomy. So, how was the "Dayan Calendar" formulated?

First, we need to understand that the formulation of the "Dayan Calendar" was based on a large amount of actual observation data. When formulating the "Dayan Calendar", Yuan Tiangang not only referred to the research results of his predecessors, but more importantly, he conducted a large number of astronomical observations and obtained rich first-hand information. These data provided a solid foundation for the formulation of the "Dayan Calendar".

Secondly, when formulating the "Dayan Calendar", Yuan Tiangang adopted a new calculation method - the Dayan method. This method is a mathematical model based on the theory of Yin and Yang and the Five Elements, which can more accurately predict the movement of celestial bodies. Through this method, Yuan Tiangang successfully solved some difficult problems in the calendar, such as the setting of leap months, the prediction of solar and lunar eclipses, etc.

In addition, when formulating the "Dayan Calendar", Yuan Tiangang also took into account the practicality of the calendar. He reasonably set the solar terms according to the needs of agricultural production, enabling farmers to better arrange agricultural activities. At the same time, he also reasonably arranged holidays according to people's living habits, allowing people to get appropriate rest after work.

Overall, the formulation of the "Dayan Calendar" was carefully compiled by Yuan Tiangang based on his profound knowledge of astronomy and excellent innovative ability, combined with a large amount of actual observation data, using new calculation methods, and considering the practicality of the calendar. This calendar not only had a profound impact at that time, but also received wide recognition and application in later generations.

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