Yi Jing, Oracle of the Moon

Lí-Duì, Fire-Marsh/Lake
    

  What are the potential and qualities of this situation?

Lí. It is the trigram of discernment and order, of searching for truth and meaning. Lí is separating or leaving, but also clinging, holding on to things. It is what light does: discerning things, seeing their differences and similarities. Both by recognizing and acknowleding them.
  Fire can easily be extinguished, buried under earth or water. To spread light and warmth it needs to be nourished. Attention, inspiration, order and truth will make it shine wide and spread its warmth, like the sun emerging from the clouds.
  Li makes the 'now' visible, the border between past and future. The moments of 'now' fly past like birds. You will have to catch them right now, to enjoy something when it happens, to seize an opportunity, to realize a flash of insight.
  But reckon with its timing, don't try to push two days into the space of one or it will burn you to ashes.

  What is the subject, intent or hope of your question?
  Duì. Its image is the marsh, it captures the flow of water and the flow of words and emotions. It is the trigram of gaining fame and fortune, but only when ambition has no hold. One needs balance between one’s own wishes and the rules of right conduct.
  Dui means 'open' or 'to open'. The words of Duì are compelling, persuasive, they open the minds of others.
  Duì is the spirit of pure autumn, which is a good time for results but not for the start of something new. Like the autumn harvest time, Dui is contained within borders, it has limits. It has variable beginnings but a definite end. If you need to finish something, then do it now.

  What do you want or need to do, or what will fate cause to happen in this situation?
  When LI activates Duì, differences come to light and it is important to clear up misunderstandings. Lake is both the joy of companionship and the fear of what people might do to each other. Or even what inner discord does. Li brings fences that keep safe or divide. Be careful with actions and enthusiasm, show only the ideas that suit the situation, then they will bring clarity and understanding.
  Duì is the trigram of exchange and empathy, but also of fights and enmity. A society of people will always contain both, so behave in a careful way, reckoning with the rules of relations. Secure your position, but without boasting. Bring in your ideas, but without compulsion.

General info about the trigram oracle: the lines, the origin, and more

The initiative

    
The top line (Heaven-line) shows the change of the focus or initiative.
变上爻为震为雷, 云翳光明, 掩火不炎。
When the upper line changes it activates Zhen, the thunder. The clouds radiate light, like shielded fire which cannot burn anything.

  Li changes to Zhèn. The fire burns hot. Thunder symbolizes an intense but short-lived energy. It can fuel fire to great heights, but can only do so for a short time. It is a good time to make decisions which don't ask for long deliberation or for starting something which is not complicated. But don't let impulsiveness overrule attention, Thunder can act in destructive ways as well, but Yin at the Heaven-line can bring rain, blessings. When a clear idea is acted on, it benefits everyone involved. It is a time in which big things can be accomplished.
  General: yin initiative in yang potential will need perseverance. Everything around seems too bright, too overbearing. Don't try to compete, but make use of what presents itself to you. When the time is yang, it offers many opportunities and resources, brilliant ideas, but few concrete results. Yin's power is to absorb and then to create from what she gathered.
  You are a good organizer, you oversee the work and inspire others while working hard yourself. You can turn visionary ideas into viable plans.
  Yin at the top line brings the rain: blessings.

    The timing of this change of the initiative:
  春天得之, 雷雹并行, 震动发生。
  夏秋雷施物利,
  冬则非宜。
  In the spring, this means that thunder and hail occur simultaneously; shocks will take place.
  In summer and autumn, thunder is beneficial to all beings.
  In winter thunder is not appropriate.

The subject

    
The bottom line (Earth-line) shows the change of the field or subject.

  The bottom line is stationary yang. 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, even food for thought. It is the line of the earth, of resources and realization. It is a 'receiving' line, the earth needs food to develop things.
  Here she is yang, she does not absorb or concretize, she is giving. Things look interesting and bright and give back. What you want to achieve inspires you, but take care not to deplete resources. Things will gain clarity but it is not yet a time of concrete results.
  Yang at the bottom line brings balance between yin and yang. Its light penetrates the undefined power of the earth-line, it inspires yin to make its imaginings grow, and it gives each creature or plan or venture its rightful structure.

Enjoy the now and its possibilities.

The outcome

    
The middle line (Man-line) shows the outcome.
  变中爻为乾, 日落于天, 晚景逼迫, 光华隐藏, 难以超越。
When the middle line changes it activates Qian. Sunset in the sky, the evening landscape contracts, the brilliance of the sun hides and cannot surpass itself.

   When Fire changes to Heaven, Qian supports the fire, it doesn’t go too high. This indicates a gifted character. The change is from yin, doing the work, to yang, where it shines.
  The change from yīn to yáng will be bright and bring joy. Bright sunny days will alternate with showers of nurturing rain, the ruler will be good for the people and they will be happy and proud, the crops will abound.
  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 change of the outcome:
  春日无处不蒙和煦,
  夏日万域畏其炎热,
  秋日旱干而万物焦枯,
  冬日可爱而天下皆暴其昭明之德。
  The spring sun is pleasantly warm everywhere,
  The summer sun's scorching heat is feared in all regions.
  The autumn sun is dry, it withers all living things and causes discord.
  The winter sun is amiable, and all under heaven expose themselves to its luminous virtue.

Overview of the lines.
Activating (when the second is different) or stationary (when they are similar)

  A Yang line is generally bright and giving. Yang is great for enthusiasm and spreading joy or success, but don’t expect solid results.
  A Yin line generally does the work. Yin absorbs and converts resources into tangible results. It brings peace 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 activated Yin: this is a good time to work on ideas. Usually, yin at the top is very positive and creative, there is balance between yang and yin, ideas and their possibilities can become reality.

  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 Yang: the subject is clear and generous and responds to the initiative. Usually yang at the bottom is positive, there is balance between yang and yin.

  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. 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. Occasionally not of the concrete kind, but joy and satisfaction are valuable as well.

  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. Stationary helpers are part of the core meaning, they are your soul talking. They reinforce the overall power of a reading.
  Advice for the initiative: Zhen, Thunder with his energy and stimulation and quick actions.
  Advice for the subject: Gen, Mountain with his constancy, his ability to make things endure, is lacking here or not needed. Yang remains Yang.
  Advice for the outcome: Qian, Heaven, with his severe structure and his timing.
  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.
  Many translations from "Yijing astrologie" by Harmen Mesker (Dutch).
  For divining with trigrams, see the video by Tin Yat Dragon