How did the people who repaired the Forbidden City crooked it?

to build a city, people must first build one? Central station? As the geometric center of the city, from the Western Zhou Dynasty to the Liao, Jin and Song Dynasties, the center of the city is always changing, people often say? Central axis? Nature also drifted in the Central Plains, until the Yuan Dynasty, when Mongolian fighters swept across the square, and the Yuan Dadu established by Kublai Khan, which is now Beijing, became the political center of the country. The layout of the streets of the Yuan Dadu City laid the basic pattern of Beijing today.

In the early years of Hongwu, Xu Da Chen Bing, a general, was at the foot of Yuan Metropolis, and tens of thousands of Ming troops entered the city by filling trenches at Qihuamen, while Yuan Shundi fled. Out of the idea of destroying the luck of Yuan Dynasty, Xu Da quietly did several major things according to Zhu Yuanzhang's will:

1. Drive all the residents of the metropolis to Kaifeng, Henan;

2. Quickly emigrate from all over the country to enrich the population of Peiping;

3. Destroy the Yuan Palace completely. (Ming Dynasty Xiao Xun wrote "The Legacy of the Forbidden City")

The Forbidden City was the political center of the Ming and Qing dynasties, which survived for hundreds of years. Now, as a national museum, it contains a large number of cultural relics and has become a landmark attraction in Beijing. Every year, Chinese and foreign tourists come to visit in an endless stream. You can take a panoramic view of the Forbidden City from high altitude, only to find that the Forbidden City turned out to be crooked. How did the Forbidden City get tilted? ?

The Forbidden City was the residence of the emperor, and its builder was the most outstanding architect at that time. From the structure of the Forbidden City to various carving techniques, we can see that the builder's skills were superb. Why is the whole Forbidden City crooked? It's not square at all Kui Zhongyu's research in the Academy of Sciences confirmed that the central axis and meridian of Beijing did deviate a little. ?

As soon as this statement came, researchers from all provinces paid attention to the central axis of Beijing. In order to verify the skew degree of the Forbidden City, many experts also made a simple experiment. Teacher Kui put a black tape on the central axis of Beijing, nailed three bamboo poles nearby, and waited until noon to see the overlap of the shadow of the bamboo pole and the tape. If they are combined, it means that the central axis is positive; if there is deviation, it means that it is crooked.

At noon, the shadow and the tape really showed a deviation of two degrees. At this time, someone explained that Beijing is at 116.39 degrees east longitude, and the Beijing time we have been using is 12 degrees east longitude. This has an error of more than 14 points from the actual time, so it is not that the Forbidden City is crooked, but that the East longitude used in Beijing has an angular deviation.

Later, experts found out the reason after an investigation by Zexi. Although the Forbidden City was built by Zhu Di, the central axis of Beijing was determined in the Yuan Dynasty, and the Forbidden City was also built in imitation of the capital of the Yuan Dynasty. As we all know, there were two capitals in the Yuan Dynasty, one was Shangdu and the other was Dadu. When Kublai Khan built the Capital of the Yuan Dynasty, he deliberately pulled the central axis into the Capital of the Yuan Dynasty, so that the positions of the two capitals could be linked. Kui Zhongyu went to the Shangdu site in Yuan Dynasty for measurement, and there were several degrees of errors with the central axis here, which proved the accuracy of this statement. Moreover, ancient times did not like square buildings, and the Forbidden City before the Qing Dynasty was also biased.