Hi Ivelisse64,
Xuan Kong Liu Fa originated from the Tai Ji and split into the Yin and Yang polarity as the 1st line. It is again split into the next Yin / Yang polarity as the 2nd line forming the Major / Minor Yin group and Major / Minor Yang group. Again it is split into the next Yin / Yang polarity as the 3rd line. The resultant is the 8 Trigram which the Yang polarity group consist of Qian, Dui, Li, and Zhen. The Yin polarity group are Xun, Kan, Gen and Kun.
Their locations are Qian [Heaven] (S), Dui [Marsh] (SE), Li [Fire] (E), Zhen [Thunder] (NE), Xun [Wind] (SW), Kan [Water] (W), Gen [Mountain] (NW) and Kun [Earth] (N) and is based on the Early Heaven Arrangements.
The relationship of the Trigrams as follows;
Yang Gender:
Qian (Father) All lines Yang,
Zhen (Eldest Son) 1st line Yang,
Kan (Middle Son) 2nd line Yang and
Gen (Youngest Son) 3rd line Yang
Yin Gender:
Kun (Mother) All lines Yin
Xun (Eldest Daughter) 1st line Yin
Li (Middle Daughter) 2nd line Yin and
Dui (Youngest Daughter) 3rd lin Yin
The Perfect Pairing are
Father and Mother
Eldest Son and Daughter
Middle Son and Daughter and
Youngest Son and Daughter
Because of the Harmony, the chinese poem is;
Heaven and Earth set their position,
Thunder and Wind are mutual companion,
Mountain and Marsh channel the Qi,
Water and Fire does not against each other.
I shall later continue on the 10 Heavenly Stems and the 12 Earthly Branches which interacts and form the 24 Mountain directions.
Meantime do take care,
Best Regards Always,
astroace