Shuogua Zhuan: Qian denotes the heaven, therefore it is called father. Kun denotes the earth, therefore it is called mother. Zhen, in the first taking obtains male, therefore is called the eldest son. Xun, in the first taking obtains female, therefore is called the eldest daughter. Kan, in the second taking obtains male, therefore is called the middle son. Li, in the second taking obtains female, therefore is called the middle daughter. Gen, in the third taking obtains male, therefore is called the young son. Dui, in the third taking obtains female, therefore is called the young daughter.

Shuogua Zhuan: "God comes forth in Zhen. All things are well-arranged in Xun. Meet each others in Li. Receive aid in Kun. Rejoice in Dui. Begin to be prominent in Qian. Toil in Kan. The achievement we say means Gen.
All things come out in Zhen, Zhen corresponds to East. It is orderly in Xun, Xun corresponds to Southeast, orderliness denotes all things are clean at the same time. The Li denotes brightness, all things meet one another, it is the trigram of south. The sages face to the south to administer affairs of the world, and govern towards the brightness, because the idea was taken from this. The Kun denotes earth, all things receive nourishment from it, therefore it is said 'Receive aid in Kun.' Dui corresponds to exact autumn, all things are rejoiced, therefore it is said 'Rejoice in Dui'. Begin to be prominent in Qian, Qian is the trigram of northwest, it denotes Yin and Yang approach each other. Kan denotes water, it is the trigram of exact north and denotes toil, all things return, therefore it is said 'Toil in Kan'. Gen is the trigram of northeast, all things achieve the completion then achieve the commencement, therefore it is said 'Bring achievement in Gen'."

Xici Zhuan says, "In Change there is the Taiji/Axis/Supreme Polarity. This gives rise to the Two Modes; the Two Modes give rise to the Four Images; the Four Images give rise to the Eight Trigrams."
Note: Taiji is usually translated as "Supreme Ultimate" and sometimes as Supreme Pole, Supreme Polarity, Grand Terminus.
Shuo Zi (Yong): "Qian 1; Dui 2; Li 3; Zhen 4; Xun 5; Kan 6; Gen 7; Kun 8. Qian, Dui, Li and Zheng are Yang. Xun, Kan, Gen and Kun are Yin. Qian and Dui are Tai Yang. Li and Zhen are Xiao Yin. Xun and Kan are Xiao Yang. Gen and Kun are Tai Yin."

Shuogua Zhuan: "Heaven and Earth settle on their positions, mountain and an area of water (marsh) interchange their vitality; thunder and wind approach each other; and water and fire do not repel each other. Eight trigrams mutually interlock with each other. Enumerating the past is compliance. Knowing the future is anticipation. Therefore Yi is anticipatory enumeration."
Shao Zi (Yong): "Qian South, Kun north, Li East, Kan West, Dui resides South-east, Zhen resides North-east, Xun resides South-west, Gen resides North-west."

Month (Terrestrial/ Earthly Branch)	Jeng's annotation to Yueling (seasons of the year)	Hexagram
Zi (Eleventh month)	Mid winter, the sun and moon meet at Xingji house Winter solstice, Yang starts its growth. Fu is the hexagram of one Yang, and thus is assigned for the month.	Fu
Chou (Twelfth month)	Late winter, the sun and moon meet at Xuanxiao house Twelfth month is the month of twoYang. Lin is the hexagram of two Yang, and thus is assigned for the month.	Lin
Yin (First month)	Early spring, the sun and moon meet at Zouzi house First month is the month of three Yang. Tai is the hexagram of three Yang, and thus is assigned for the month.	Tai
Mao (Second month)	Mid spring, the sun and moon meet at Jianglou house Second month is the month of four Yang. Dazhuang is the hexagram of four Yang, and thus is assigned for the month.	Dazhuang
Chen (Third month)	Late spring, the sun and moon meet at Daliang house Third month is the month of fiveYang. Guai is the hexagram of five Yang, and thus is assigned for the month.	Guai
Si (Fourth month)	Early summer, the sun and moon meet at Shichen house Fourth month is the month of fullYang. Qian is the hexagram of full Yang, and thus is assigned for the month.	Qian
Wu (Fifth month)	Mid summer, the sun and moon meet at Chunshou house Summer solstice, Yin starts its growth. Gou is the hexagram of one Yin, and thus is assigned for the month.	Gou
Wei (Sixth month)	Late summer, the sun and moon meet at Chunhuo house Sixth month is the month of twoYin. Dun is the hexagram of two Yin, and thus is assigned for the month.	Dun
Shen (Seventh month)	Early autumn, the sun and moon meet at Chunwei house Seventh month is the month of threeYin. Pi is the hexagram of three Yin, and thus is assigned for the month.	Pi
You (Eighth month)	Mid autumn, the sun and moon meet at Shouxing house Eighth month is the month of fourYin. Guan is the hexagram of four Yin, and thus is assigned for the month.	Guan
Xu (Ninth month)	Late autumn, the sun and moon meet at Dahuo house Ninth month is the month of fiveYin. Lin is the hexagram of five Yin, and thus is assigned for the month.	Bo
Hai (Tenth month)	Early winter, the sun and moon meet at Ximu house Tenth month is the month of fullYin. Kun is the hexagram of full Yin, and thus is assigned for the month.	Kun