Yuan Tiangang, a famous astronomer, mathematician and Taoist priest in the Tang Dynasty, led a legendary life. However, it is curious that why a historically real person would be deified and become a mythical character.

Firstly, we need to understand Yuan Tiangang's outstanding achievements in astronomy and mathematics. His "Dayan Calendar" was an important calendar in the Tang Dynasty, and its establishment and implementation played an important role in promoting social and economic development at that time. In addition, he also made important contributions in mathematics. His "Zhui Shu" was the earliest mathematical treatise in China, which had a profound impact on the development of ancient Chinese mathematics.

However, Yuan Tiangang's achievements are not limited to the scientific field. He was also a believer and propagator of Taoism, and his Taoist thoughts and practices had an important impact on the religious culture of the Tang Dynasty. His Taoist cultivation methods and ideas were widely spread and practiced by later generations, and he was also respected as an important figure of Taoism.

In addition to the above achievements, Yuan Tiangang's life experience and personal image are also important reasons for his deification. His life was full of mystery and legend, and his predictive ability, cultivation achievements and personal charm left a deep impression on people. These factors, combined with later generations' worship and respect for him, gradually turned him from a historical figure into a mythical character.

Overall, Yuan Tiangang was deified due to his outstanding achievements in science and religion, as well as his mysterious and legendary personal image. His life and deeds were widely spread and praised by later generations, ultimately making him a mythical figure in legend.

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