Master, what is the intercourse of Yin and Yang in Feng Shui?

Yin and yang intercourse, infinitive, intangible, free to imagine! The sun is yang, the moon is yin, and the sun and the moon run as yin-yang intercourse. Yang in the daytime, Yang at night, and Yin and Yang alternate day and night. The ground is yang, the mountain is yin, and the mountain surrounds the ground, which is the intercourse of yin and yang. The mountains are yin, the water is yang, and the mountains and rivers are intertwined, which is the intersection of yin and yang. ...........