Mountain Classic is an ancient book of China in the pre-Qin period. Generally speaking, it mainly describes ancient myths, geography, products, witchcraft, religion, ancient history, medicine, folk customs, nationalities and so on. Some scholars believe that Shan Hai Jing is not only a myth, but also an ancient geography, including some overseas mountains, rivers, birds and animals. There are eighteen volumes of Shan Hai Jing, including five volumes of Shan Hai Jing, eight volumes of Hai Jing, four volumes of Huang Da Jing and one volume of Hai Nei Jing, with about 365,438+0,000 words. Recorded 100 information about geography, customs, products and other countries, 550 mountains, 300 waterways, and the scenery of various countries. Among them, Mountain Classic contains most reconnaissance records of wizards, alchemists and temple officials in past dynasties. After a long period of biography, it will be exaggerated, but it still has high reference value.
The Shanjing River was considered as the mouth of the Yellow River in the early Warring States period. The ancient Yellow River downstream "the mountain passes through the big river" seen in the pre-Qin literature is ignored by the world because there is no record of river runoff in the Mountain Classic. In recent years, Tan Qixiang found that after the Gong Yu River reached Shenxian County, Hebei Province, the "mountains and rivers" separated from it and flowed northward, then merged with Tuotuo River, and then flowed northward to the south of Lixian County.
Geographical time: Due to the rotation of the earth from west to east, different regions in the same latitude see the sunrise early and late, and the eastern time is earlier than the western time. This different time due to different latitudes is local time. Every eastward 15 degrees, the time is early 1 hour, and every westward 15 degrees, the time is late 1 hour.