Fortune-telling Yin and Yang _ What does fortune-telling Yin and Yang mean?

"People in the West who leave Yangguan for no reason", what does Yangguan mean?

Yangguan was the throat of China's ancient land transportation, the only place where the ancient Silk Road South Road passed, near the antique beach in the southwest of Dunhuang City, Gansu Province.

Yangguan is named Yangguan because it is located in the south of Yumen Pass. During the period of Emperor Wu of the Han Dynasty, there were four counties and two customs in Hexi, and Yangguan was one of the two customs. As the throat gateway of the western regions, Yangguan is also an important pass of the South Road of the Silk Road and a battleground for ancient military strategists.

In order to resist the Huns, the Western Han Dynasty set up four counties of Wuwei, Zhangye, Jiuquan and Dunhuang in the Hexi Corridor, and set up two passes of Yumen Pass and Yangguan Pass.

According to the research of archaeologists, Yangguan occupied the geographical advantage of "one person guarding it, ten thousand people can't force it" at that time, so it was naturally set as the military base of the garrison.

Yangguan was an oasis basin in ancient times, with rich water resources and fertile land. There was a developed ditch burning culture two or three thousand years ago. Later, the river dried up and silted up, and was gradually buried by wind and sand, and was abandoned in Sui and Tang Dynasties.

In the past, it was called the Western Regions in the west of Yangguan and Yumenguan. When you go out, it is a vast sea of sand and a desolate Gobi. When you leave here, you have to travel far away, so the poem will write "there is no reason to go out to Yang Guan in the west" to express your farewell.

At present, Yangguan has been seriously eroded by yellow sand and has been included in the scope of site protection. The ancient customs, ancient cities, ancient roads, the Great Wall, ancient tombs and ancient water sources of Yangguan site are of great research and ornamental value.