How to use Shen Yin Xu Jiazi?

The great ecliptic day is usually calculated by Qinglong ecliptic, with six auspicious days in the ecliptic and six ominous days in the underworld; At the same time, the twelve hours of the underworld are also calculated by the ecliptic. The starting method of the Song formula of Qinglong ecliptic is:

Need to add another child, but in Yin.

Chen held the dragon's position and saved it at noon.

The meridian is close to the divine land, and ugliness is not on it.

In the Song formula, "need to add a child" refers to the month (the first month before beginning of spring) and the second day of July (the July before beginning of autumn Bailu) as the Qinglong ecliptic day; Silver Day and Divine Day are the ecliptic time of Qinglong. "You Mao is in the shade" means that the cloudy days in February and August are Qinglong ecliptic days; Maori and one day Yin Shi are the ecliptic time of Qinglong.