Why Mount Song is called the "Middle Sacred Mountain"
Of China's five sacred peaks, Songshan stands not at the compass extremes but at the very centre — and that position shaped 3,000 years of ritual, astronomy and statecraft.
When the Zhou dynasty king surveyed his realm in the 11th century BCE, his astronomers measured the shadow of the sun at midday and concluded that the land below Mount Song was the exact centre of the world — the "Earth Centre" (地中). To rule from the centre was to rule with cosmic legitimacy. The Gaocheng Observatory near Dengfeng, rebuilt in stone by the Yuan astronomer Guo Shoujing around 1276, still stands where those measurements were made; it is the oldest surviving observatory building in China.
The centre position gave Songshan a unique religious density. Within thirty kilometres you can stand at the cradle of Chan Buddhism (Shaolin), one of the four great Confucian academies (Songyang), and major Taoist sites — the "three teachings" layered on one mountain. This is why UNESCO inscribed the "Historic Monuments of Dengfeng" as World Heritage in 2010: not a single monument, but a landscape of ritual architecture tracing the idea of the centre.
For the visitor, this means Songshan rewards context. Read the plaques at Songyang Academy after understanding the Earth Centre idea, and the two ancient cypresses stop being just old trees — they were named "Generals" by an emperor who came here to affirm his own centrality.