Why is the imperial tomb in the north and south of Xi 'an?

It is well known that in ancient times, emperors were very fond of geomantic omen, so some emperors would like to find some places with better geomantic omen to build their tombs. So in ancient times, the place where geomantic omen always pays attention to sitting facing south is the best place for geomantic omen, because the south represents Yang and the north represents Yin, and only the place where Yin and Yang harmonize is the best place for geomantic omen.

But Qin Shihuang's mausoleum faces east from west, which is puzzling to many people, because there is no record of this in Feng Shui, so Qin Shihuang's practice makes many people curious. According to the records, there are several reasons why Qin Shihuang did this. One of them is that sitting west facing east was the best way to sit in the Qin Dynasty, so Qin Shihuang's mausoleum was built in this way, in order to reflect Qin Shihuang's nobility and his noble status symbol, so people at that time built Qin Shihuang's mausoleum into this way.