I Ching, Yijing or Zhou Yi
"Oracle of the moon": © 2000 LiSe
Yi Jing, Oracle of the Moon

What are the potential and qualities of this situation?
Gěn, 'ward off'. His image is Mountain. He is high but does not boast, is strong but does not force anyone. Gen may be grumpy or a recluse but has a good heart and cares. Gěn is about individuality, staying true to yourself even when it is difficult and giving in would be easier. Gěn stands high above the valley below and seems aloof, but the mountain shelters and feeds the valley, makes the clouds release their water and sends it down to the vegetation and all creatures at its foot.
What is the subject, intention or hope of your question? And what is your power in this?
Xùn, 'Choosing', the character xun is a table with tokens or seals and a pair of hands. Her attribute is Wind. She is the master of inspiration. She is good at communicating and spreading rumors, news, ideas, orders or goods. The officer who spreads the wishes of the sovereign. She is patient and precise, good at detailed work. She can penetrate and influence physically and mentally. Wind can bring a mood or atmosphere which is clearly felt. Wind can also spread disease, but her absence can cause decay.
'Xùn' means counting, choosing or being chosen. It is giving or having a direction, a purpose, a 'seal' or mandate. It can be in the way fate does, a path that can hardly be avoided: "your number is up". Being chosen is stronger than the freedom of choosing. It also works in physical ways, defining 'what you are' and the urge to grow into it and live and multiply it.
Like water always follows gravity, the wind follows air pressure, answering the 'atmosphere', which makes her stronger and more persistent than moving toward a goal.
Your intuition will have a stronger influence on your road than your mind, even though Wind also relates to thoughts. Thoughts follow the decisions of the heart. Wind follows the voice of the Earth, the voice of life.
What do you want or need to do, what can you truly do, or what will fate unfold in this situation?
When Gěn activates your Xùn, the strong inner 'You' comes out. It can show its beauty or its flaws, its strengths or weaknesses. Gěn is 'character', Xùn is 'fate or destiny'. They both seem immutable, but when they appear together in living beings, they are also their power to make change possible, against all odds. It is the willpower to take your life, or everything you do, into your own hands, while adjusting your true 'seal' or mandate and aligning fate with the possibilities of your situation. Beware of giving expression to insignificant wishes or ill-considered decisions, neither your own nor those of others: they bring with them a fate that does not suit you.
Gěn and Xun are the 'origin' of hexagram 18. First trigram is the upper trigram (called '悔 huǐ, regret' or 'consult': the problem that makes you consult the oracle). Second trigram is the lower or inner trigram (called '真 zhēn, true': the answer of the oracle for this situation: the advice how to deal with it).

The top line is stationary yang. A yang initiative, entering a yang world, fits right in. Both are clear and inspiring, full of plans. Even when other things change, you will remain giving, pouring ideas, efforts or money into this situation. Yang brings and spreads ideas with a good basic structure, It is the master of good timing and planning, but not of finding a final solution or concrete results.
Stay within limits, Yang is also prone to deplete itself. It is relentless, and it can focus so intensely on mental images that they can turn into air castles or delusions. Yin is necessary for concrete results but not before the planning is right, too early can be disastrous, no matter the quality of your ideas or how determined you are.
Yang has the talent to enjoy the road
before reaching any destination.
The Earth-line is stationary yin. This line is the subject, or the ‘field’ where you pour in or find both the cause and the means for your initiative: space, material, helpers or other people, resources and realization, even food for thought. It is a 'receiving' line, the earth needs input and resources to make things grow and bring concrete results.
Your subject or project will stay attractive, but it will continue to absorb and process and use it to continue the work. It will not shine on its own or show increase to the outside, the work of building up happens in the background, making your vision concrete, or whatever comes your way.
Beauty comes from the space within.
When the middle line of Mountain changes to yang, activating Xun, the Wind, the mountain gets his inherently impressive image. Absorbing and processing his surroundings, he is an inspiring and giving leader. With the help of Xun his influence will spread and he will earn respect and admiration. It is the power of a strong character, being true to oneself and to others. Able to overcome fear and greed which keep one from greatness. This is not an easy time and rules or past experience will not apply. It is a time of hidden danger. You will need willpower and persistence to expose and conquer it.
General: When yin meets yang, it is time to follow up on your inspirations, to give a structure to visions or to share them. Performing the work turns into providing leadership. Others ask your advice or expect direction. The focus is on moving forward, showing results, enjoying what has been accomplished. You can energize and initiate, reconcile ideas and reality.
The outcome changes from absorbing efforts or resources to giving back. You will need focus for what you do and the freedom to see chances and flow along with them. Use intuition and quick reactions; strict rules close off many opportunities.
The timing of this outcome: (Time can refer to the seasons of the year, the hours of a day, the progress of an undertaking, a state of mind - anything that has a beginning, a peak, a decline, and an end. See "Timing")
春夏生蠹, 秋冬损物, 不如天风和时为美也。
Spring and summer bring forth destructive things;
Autumn and winter bring reduction of things.
It is not as good as when the wind and time were in harmony.
An activated Yang line is generally bright and giving.Yang is great for enthusiasm and spreading joy or success, for structure, but don’t expect solid results.
An activated Yin line generally does the work. Yin's creativity absorbs and converts resources into tangible results. It brings peace, beauty, and a sense of security.
The initiative (top line or Heaven line) is the intention or focus. Your ideas, plans, or what you want, or something that happens and you want to influence it or use its possibilities.
In this answer the line is stationary Yang: the initiative is clear and strong, this is a good time to develop visions and plans, pouring in creativity, efforts and enthusiasm.
The subject (bottom line or Earth line) is the 'reality' of your question or the ‘field’ of action. A situation or person, resources, materials, facts.
In this answer the line is stationary
Yin: She is the most difficult to influence, she is careful and follows her own creativity and decisions, but she is the one who turns resources into concrete results.
The outcome (middle line or Man Line) is what you or others or fate cause to happen 'between Heaven and Earth'. It is the outcome of this question. It can be physical or mental or both. If this is a yes/no question, then yang means yes, yin means no or 'not yet'. Both can be good or bad, depending on the question.
In this answer the line is activated
Yang: if you need increase, this is a great line. Your efforts will show results. Often not of the concrete kind, but joy, satisfaction and structure have their own value.
About the 3 lines of the trigrams and the spirit helpers:
Each line, active or at rest, summons one of the 8 trigrams as a Helper. For an activated line: telling you what you need - or about a problem area or something to avoid.
For a stationary line: this is what you already have or do or what you don't need. Often we just need a reminder of our abilities. Or it could be what you wish or fear - but will not happen.
Active lines are the helpers to change things, they listen to intentions, which can come from you, surroundings, or fate. Stationary helpers are part of the core meaning, they are your soul talking, but they also see the impossibilities or what is lacking at the moment. They reinforce the overall power of a reading.
Helper for the initiative: Kun, Earth, with her ability to nurture and concretize, is lacking here or not needed. Yang remains Yang.
Helper for the subject: Li, Fire, with her power to discern and create order, is lacking here or not needed. Yang remains Yang.
Helper for the outcome: Xun, Wind, with her power to choose and influence.
But when things are not satisfying, it might be that one or more helpers don't help enough - or try too hard. Or maybe you don't listen carefully enough.
This oracle is NOT according to the Neigua Chuwaili, a chapter of the Heluo Lishu, which is meant to be read and used in Chinese astrology. But I found beautiful texts about the trigrams in the Neigua Chuwaili and borrowed them for this trigram oracle.
For those who are interested in the Heluo Lishu see the course by Harmen Mesker.
See also "Yijing astrologie" by Harmen Mesker (Dutch).
The guide to calculating your birth hexagram.
For divining with trigrams, see the video by Tin Yat Dragon