How to correctly understand the 40-mile square and 70-mile square describing the size of the capital in ancient books?

In the process of understanding and exploring history, we often need to consult some historical materials recorded in ancient books. When consulting, we often see data describing the size of a country's capital 70 miles and the size of a country's king 40 miles. Then how can we understand or explain it correctly?

Let me give you an example to illustrate, "Yi Zhou Shu? Be a pheasant: And turn politics into a week in a big city in Middle-earth. This city has 1720 feet, and this square has 70 miles. The south is in Luoshui and the north is in Mangshan, thinking that the world is big. ?

This is the record of Zhoucheng (Luoyi) built in the Western Zhou Dynasty. Qili in Qiaofang means big city and outer city. Now many people and materials understand it as Fiona Fang 70 Li. Let's see how big seven miles are in Fiona Fang. Seven miles in Fiona Fang is the area of a circle with a radius of 70 miles. Converted into kilometers, 70 miles is 35 kilometers, 35? 35? 3. 14=3846.5 (square kilometers). In 20 19, the built-up area of Luoyang was about 300 square kilometers. Seventy miles of Fiona Fang is about the size of 13 Luoyang now. This is outrageous! In fact, the south of Luoyi did not cross the Luohe River. Let's look at the records: the south is in Luoshui and the north is in Mangshan. ? Mangshan is Mangshan. This difference is too far, too outrageous, so this understanding is absolutely wrong.

The correct understanding of square 70 Li is square 70 Li, which means the area of 70 square Li. I want to make it clear that it is 70 square miles, not 70 square miles. The two are different. 70 square miles is an area of 70 square miles, and 70 square miles is a square area with a side length of 70 miles. It is also wrong to interpret it as 70 square miles. Therefore, it is logical that the outer city of Luoyi (Chengzhou) covers an area of 70 square miles and its side length is about 8.4 miles.

To sum up, in ancient records, the 40-Li and 70-Li squares that describe the capital city and the king city (that is, 40-Li square and 70-Li square) mean that their area is 40-Li square and 70-Li square. Whether this question is understood correctly or not is very important for archaeology. Incorrect understanding requires a lot of manpower, material resources, financial resources and time, so we must treat this problem correctly and correct it from now on.