What does the central axis of Beijing mean?

Now many people, including taxi drivers, say that there is a central axis road. Most people refer to the road from the North Bridge of the Bell Tower in the North Second Ring Road to Anhua Bridge in the North Third Ring Road and then to Beichen Bridge in the North Fourth Ring Road. Because it is relatively closed and traffic jams are not frequent, it is a good choice to go from the North Second Ring Road to the North Fourth Ring Road.

Then there is the newly widened road, from Qianmen 1st Road south along Qianmen Street to Yongdingmen Bridge in South Second Ring Road, then along Yongdingmenwai Street to Muxiyuan Bridge in South Third Ring Road, and then along Nanyuan Road to Dahongmen Bridge in South Fourth Ring Road to Sanyingmen. It is a highlight of Cheng Nan, with newly opened bus rapid transit lines (the platform is on the left, and now some doors are on the right, which is very interesting).

The so-called central axis is probably the same connection and extension of these two roads. Because there are ancient buildings such as Qianmen, Tiananmen Square, Tiananmen Square, Forbidden City, Jingshan, Bell Tower and Drum Tower. It is impossible to have a road or even a subway directly.

Now it is said that the study found that the central axis of Beijing does not coincide with the meridian passing through Tiananmen Square, but there is an included angle in the middle. Finally, it is proved that this central axis actually points to a place in Inner Mongolia, the former capital of the Yuan Dynasty ruler Jianyuan Dadu (now Beijing). In the Yuan Dynasty without modern surveying and mapping tools, it is really great to be able to do this!