What is the Qinglong in Feng Shui and why is it called Zuo Qinglong?

The ancients roughly divided the sky into four major areas: the stars in the east were combined into the image of a dragon, which was called "green (blue) dragon"; the stars in the west were combined into the image of a tiger, which was called "green (blue) dragon". "White Tiger"; the stars in the south combine to form the image of a flying bird, which is called "Suzaku (bird)"; the stars in the north combine to form the image of a tortoise and snake entangled together, which is called "Xuanwu".

The four stars of Qinglong, White Tiger, Suzaku and Xuanwu in the ancients refer to the four directions (the angle between the ecliptic and the equator is 23 degrees, 26 minutes and 33 seconds) in the east, south, west and north ( Each party has seven constellations) The name of the leader of the twenty-eight constellations, among the twenty-eight constellations and the four directions.

The seven constellations in the East are: Jiao, Kang, Di, Fang, Xin, Wei and Ji. The leader is called Qinglong.