The core of Yi-based divination, at its root, lies in mapping numbers to images and observing the underlying dynamics through those images. The shifting energies of all things in the world conceal corresponding numerical patterns, and numbers are the most direct, purest carriers of that energy.
Compared to other divination systems, Plum Blossom Numerology (Meihua Yishu)'s greatest strength lies in its flexibility, spontaneity, and practical simplicity. Among its methods, number-based hexagram casting is the most orthodox, widely practiced, and versatile technique. It requires no divination tools and no observation of physical objects—random numbers from daily life, numbers spoken on impulse, or even time-based numbers can all be used to form a hexagram.
For many self-taught practitioners of Plum Blossom Numerology, the core reason their hexagram readings turn out inaccurate isn't a lack of interpretive skill—it's improper number selection during casting, miscalculated changing lines, or confusion between the primary and derived hexagrams. Hexagram casting is the foundation; once the calculation goes astray, every subsequent interpretation drifts away from the true underlying dynamics, making accurate results nearly impossible.
While number-based hexagram casting appears simple on the surface, it actually embodies the ordered logic of Xiantian (Pre-Heaven) Yi principles. Only by mastering this standard method can one truly cross the threshold into Plum Blossom Numerology.
I. Understanding the Underlying Logic: The Xiantian Principle Behind Number-Based Hexagram Casting
Traditional Plum Blossom Numerology belongs to the Xiantian (Pre-Heaven) Ba Gua system, in which the Xiantian trigram numbers are fixed and unchanging. This is the core foundation for all number-based hexagram casting—universal and permanent.
The Xiantian Ba Gua correspondence numbers are: Qian 1, Dui 2, Li 3, Zhen 4, Xun 5, Kan 6, Gen 7, Kun 8.
The core rule is captured in a single classical principle: "Eight determines the trigram, six determines the moving line."
For any number, divide by eight and take the remainder to determine the corresponding Xiantian trigram, forming the hexagram. Then take the total sum of the numbers, divide by six, and take the remainder to determine the core changing line (moving line). The moving line is the pivotal mechanism of a hexagram—the key breakthrough point for understanding shifts in human affairs and trends of fortune and misfortune.
In essence, number-based hexagram casting uses random numerical patterns to capture the heaven-and-earth energy and human intention present in a given moment. When one's intention is focused and the number selection follows proper rules, the resulting hexagram will naturally align with the true state of affairs.
II. Essential for Beginners: Two Mainstream Standard Methods for Number-Based Hexagram Casting
In daily practice, number-based hexagram casting divides into two methods: the double-number method and the single-number method. Together they cover all number-selection scenarios, with clear rules and strong practicality—beginners can apply them directly.
1. Double-Number Method (Most Common and Stable)
The querent freely states two numbers, or randomly selects two sets of numbers, forming the upper and lower trigrams. This is the most standard method with the most stable energy flow, and is the preferred choice in practice.
Step One: Determine the Upper and Lower Trigrams
The first number forms the upper trigram; the second number forms the lower trigram. Divide each by 8 and take the remainder to determine the corresponding Xiantian trigram.
If the remainder is 0 (i.e., evenly divisible), it corresponds to the Kun trigram, using the number 8. For remainders 1 through 8, they directly correspond to the Xiantian trigram numbers.
Step Two: Determine the Moving Line
Add the two numbers together to get the total. Divide the total by 6 and take the remainder to determine the position of the moving line.
Remainders of 1, 2, 3, 4, or 5 correspond directly to the first through fifth lines moving; a remainder of 0 (evenly divisible) indicates the sixth line moves.
2. Single-Number Method (For Spontaneous, On-the-Spot Use)
When only a single random number is available, it can be split to form a hexagram, suited for situations of sudden intuition or quick divination.
Step One: Split to Determine the Trigrams
For an even number of digits, split evenly. For an odd number of digits, put fewer digits first and more digits second. The first half forms the upper trigram, the second half forms the lower trigram; divide each by 8 to determine the trigrams.
Step Two: Sum for the Moving Line
Sum all the original digits together, divide by 6, and take the remainder to determine the moving line position—following the exact same rule as the double-number method.
III. Precise Practical Demonstration: A Complete Worked Example
Using the most accessible practical example, here is a full walkthrough of the entire process—casting the hexagram, determining the trigrams, and identifying the moving line—applicable to any everyday scenario.
Example: Using the numbers 3 and 9 with the Standard Double-Number Method
- Upper trigram from 3: since 3 is less than 8, it directly corresponds to the Li trigram;
- Lower trigram from 9: 9 ÷ 8 leaves a remainder of 1, corresponding to the Qian trigram;
- The primary hexagram is: Fire over Heaven, Da You (Great Possession);
- Moving line calculation: 3 + 9 = 12, and 12 ÷ 6 leaves a remainder of 0, so the sixth line moves;
- Transformed hexagram from the moving line: for the sixth line, yin changes to yang or yang changes to yin, producing the transformed hexagram. At the same time, the nuclear hexagram (Hu Gua) is determined, used to refine the details of the matter at hand.
The entire process flows smoothly from start to finish, with no complex derivation required—as long as the number selection follows the rules, the resulting hexagram energy will naturally be accurate.
IV. Key Supplementary Method: Time-Based Number Hexagram Casting (Advanced and Versatile)
Beyond freely stating numbers, the most commonly used orthodox method in Plum Blossom Numerology is casting hexagrams using the year, month, day, and hour—suitable for passive divination scenarios where no active number selection occurs. This method's energy aligns more closely with the present time and space.
Using the lunar year, month, day, and hour as the numerical basis: the sum of the year, month, and day numbers forms the upper trigram; the total sum including the hour forms the lower trigram; the total is then divided by 6 to determine the moving line.
The advantage of time-based hexagram casting lies in the fixed nature of spatiotemporal energy, with minimal interference from stray thoughts, resulting in a more stable hexagram. This method is well-suited for divining major matters and long-term trends.
V. What to Do After Casting the Hexagram? Core Logic for Basic Hexagram Interpretation
Casting the hexagram is only the beginning—truly understanding the trend it reveals is the core skill. Interpreting a hexagram after number-based casting follows a three-tier sequence, moving from surface to depth, layer by layer.
1. First, Examine the Moving Line: Determine the Core of the Situation's Change
In any hexagram, the moving line serves as the pivotal mechanism—it governs change, outcome, and direction. A static hexagram (no moving lines) indicates stability and little change; multiple moving lines indicate entanglement, volatility, and repeated twists and turns; a single moving line indicates a focused situation with a clear, easily discernible outcome.
2. Next, Examine Ti and Yong: Determine the Overall Tone of Fortune and Misfortune
The core principle of Plum Blossom Numerology interpretation: Ti (the Substance trigram) represents oneself; Yong (the Function trigram) represents external matters. The Ti trigram represents the querent, their inner intention, and their own state; the Yong trigram represents the matter being asked about, the external environment, and the trajectory of opportunity.
- Ti generates Yong: self-depletion—effort yields little return;
- Yong generates Ti: external support—benefactors, opportunities, and favorable circumstances abound;
- Ti overcomes Yong: self-initiative—one can control the situation and succeed against the odds;
- Yong overcomes Ti: external suppression—obstacles, depletion, and hindrances are likely;
- Ti and Yong in harmony: aligned energies—all matters proceed smoothly and favorably.
3. Finally, Examine the Nuclear and Transformed Hexagrams: Refine the Process and the Outcome
The primary hexagram reveals the present situation; the nuclear hexagram (Hu Gua) reveals the details of the process; the transformed hexagram (Bian Gua) reveals the final outcome. Combining all three allows one to clearly see the current state, anticipate mid-course twists, and fully reconstruct the complete picture of the matter at hand.
VI. Common Calculation Mistakes Beginners Should Avoid
The vast majority of inaccurate hexagram readings stem from errors in detail. Avoiding these pitfalls will significantly improve casting accuracy.
Mistake 1: Not Knowing How to Handle a Remainder of Zero
Many beginners handle a zero remainder from even division arbitrarily. The orthodox rule is clear: a remainder of 0 when dividing by 8 gives the Kun trigram; a remainder of 0 when dividing by 6 indicates the sixth line moves. This is fixed and requires no improvisation.
Mistake 2: Casting Hexagrams with Scattered Intention
Plum Blossom Numerology emphasizes single-minded sincerity. An unsettled mind, scattered thoughts, or repeated re-casting will confuse the energy field and distort the hexagram. Divine each matter only once, and select numbers with a single focused intention—this is the fundamental respect required in divination practice.
Mistake 3: Reversing the Order of the Upper and Lower Trigrams
The first number forms the upper trigram; the second forms the lower trigram—this order must never be reversed. The upper and lower trigrams correspond to heaven and earth, internal and external, before and after; reversing the order inverts the energy field, throwing the fortune and misfortune of the matter completely out of alignment.
Mistake 4: Only Examining the Primary Hexagram, Ignoring the Moving Line
The primary hexagram represents the initial state; the moving line reveals the ultimate trajectory. Ignoring the moving line and transformed hexagram means seeing only the surface of the present moment, missing subsequent developments—leading to a one-sided and inaccurate reading.
VII. Modern Practical Applications: The Scope of Number-Based Hexagram Casting
Number-based hexagram casting carries a light, agile energy with broad applicability, well-suited to divining all kinds of matters in modern life—making it highly practical.
It can be used for everyday matters such as: career decisions, job changes, project progress, fluctuations in wealth, interpersonal friction, travel safety, academic performance, and the success or failure of specific undertakings—short-term trends in human affairs.
It is not suited for rigid pronouncements about lifelong destiny or long-term Luck Pillars. Its core function is to capture the present energy dynamics, anticipate short-term trends, and support rational decision-making.
VIII. Conclusion: The True Meaning of Number-Based Hexagram Casting
Number-based hexagram casting in Plum Blossom Numerology may appear to be mere numerical calculation, but it is, in truth, a way of connecting with heaven and earth through numbers, and sensing the flow of energy through focused intention.
The number eight determines the trigram, encompassing the forms of all things; the number six determines the moving line, observing the changes in all matters. Numbers arise from the mind, and the hexagram shifts with intention—each random set of numbers is a direct reflection of one's present state of mind and the surrounding spatiotemporal energy field.
The method is the framework; the underlying energy dynamics are the essence. By mastering the standard rules for number selection, hexagram calculation, and moving line determination, and then carefully applying the Ti-Yong generating-and-overcoming analysis, one can see through simple numbers into the rhythms of rise and fall, and the patterns of gain and loss in human affairs.
The study of Yi has never been a rigid formula—it is the wisdom of following momentum and perceiving subtle change. Understanding the hexagram, discerning the trend, acting in accordance with the flow, and seizing the right moment—this is the true meaning of studying Plum Blossom Numerology.
Articles in this column are for cultural and educational purposes only and do not constitute life advice.