What is Luc Nham, and why must we specify Dai Luc Nham?
Luc Nham is an ancient divination method grouped with Thai At and Ky Mon Don Giap, commonly called the Tam Thuc. In this article, Luc Nham means Dai Luc Nham, the system that builds charts on a twelve-palace Dia Ban using Nguyet Tuong, Tu Khoa, Tam Truyen, and Thien Tuong. It must be clearly distinguished from Tieu Luc Nham, the folk finger-joint counting method many people still use for quick questions, which differs entirely in structure and interpretation. Volume 1: Introduction calls the core of this method Nham don, and stresses that Tam Truyen is the most basic part, calculable only once the Dia Ban, can, chi, and Thien Ban are complete.
In short, Dai Luc Nham is a multi-layered process: from the moment of asking, the practitioner builds a twelve-palace board, then draws four khoa and three truyen to read the story of the matter.
Dia Ban and Thien Ban: the two foundation layers of every Luc Nham chart
The Dia Ban is the fixed layer, the twelve palaces Ty, Suu, Dan, Mao, Thin, Ty, Ngo, Mui, Than, Dau, Tuat, Hoi arranged by direction. This layer does not change between charts; it is the reference frame.
The Thien Ban is the moving layer, placed by setting the Nguyet Tuong on the hour palace of the chart's moment. Volume 1: Introduction explains it by symmetry: the Nguyet Tuong is the palace of the Sun, the hour palace is the palace of the Earth facing the Sun, so writing the Nguyet Tuong character above the hour palace on the Dia Ban simulates that relationship. The book's example: during Kinh chap solar term, Vu thuy period, the Nguyet Tuong is Hoi, meeting the Mui hour, so place Hoi above Mui on the Dia Ban, and the other eleven Thien Ban palaces follow in order.
This point is crucial because all later Tu Khoa and Tam Truyen are read on these two layers. Misreading one palace skews the whole chart.
What are the steps to build a Luc Nham chart?
The process of building a Dai Luc Nham chart can be summarized in the following table, following the order presented in Volume 1: Introduction:
| Step | Action | Basis |
|---|---|---|
| 1 | Set the Dia Ban | Twelve fixed palaces by direction |
| 2 | Place the day's can and chi on the Dia Ban | Can and chi of the question day |
| 3 | Place the Thien Ban | Put the Nguyet Tuong on the current hour palace, remaining palaces in order |
| 4 | Draw the Tu Khoa | Four khoa Nhat, Nhi, Tam, Tu taken from can chi and Dia Ban |
| 5 | Derive the Tam Truyen | From Tu Khoa, using nine methods to select So, Trung, Mat truyen |
| 6 | Place the Thien Tuong | Twelve Thien Tuong placed along the Quy Nhan star circuit |
Volume 1: Introduction states clearly: before placing the Tu Khoa, four tasks must be done: set the Dia Ban, place can, place chi, place Thien Ban. Only with these four conditions can the Tam Truyen be calculated.
How are the Tu Khoa drawn from the day's can and chi?
The Tu Khoa consist of four khoa: Nhat, Nhi, Tam, Tu. Each khoa always has two characters, one above and one below. The four upper characters are all Thien Ban characters.
Khoa Nhat is taken at the palace where the day's can is placed. At that palace there is already a Thien Ban character and the day's can, so the Thien Ban character is the upper, the day's can the lower. Khoa Tam takes the day's chi already placed on the chart, in the same way. In khoa Nhi and khoa Tu, both lower characters belong to the Dia Ban.
Volume 1: Introduction also classifies khoa by the five-element relationship between upper and lower characters: a Sinh khoa is one where upper and lower mutually generate in both directions; a Ty khoa is one where upper and lower share one element, for example both Metal. This classification serves the next step of deriving the Tam Truyen.
How are the Tam Truyen derived from the Tu Khoa by nine methods?
The Tam Truyen consist of So truyen, Trung truyen, and Mat truyen, the three stages of an event: beginning, middle, and end. Volume 1: Introduction calls this the most basic part of Nham don, and to select these three truyen one must follow nine methods, including familiar ones like Tac khac, Ty dung, and Thiep hai.
The general principle is to compare generating and overcoming relationships among the Tu Khoa characters, between can and chi, between Thien Ban and Dia Ban, to find which character holds the leading role. When an overcoming relationship stands out clearly, take it as the entry point; when khoa are equal, use the Ty dung method to choose; when a situation surpasses one ordinary layer of relationship, use the Thiep hai method. The remaining methods handle special cases such as khoa with no overcoming, khoa sharing an element, or khoa with many characters of the same element.
Volume 1: Introduction does not go deep into all nine methods in the introductory section, but lists Tam Truyen as the destination of all four preceding steps. This is also a point to note: to learn Dai Luc Nham, the hardest part is not placing the board, but choosing the right method to derive the truyen.
Placing the Thien Tuong in a Luc Nham chart
After the Tam Truyen, the final step is placing the twelve Thien Tuong. Volume 1: Introduction gives the order of the Quy Nhan star circuit: Quy nhan, Dang xa, Chu tuoc, Thien hop, Cau tran, Thanh long, Thien khong, Bach ho, Thai thuong, Huyen vu, Thai am, Thien hau. These twelve Thien Tuong are considered by the book the twelve most important stars of Nham don, each chart decided by them for good or bad in each matter.
The placement is relatively complex. Volume 1: Introduction notes two things: the Thien Tuong names are always placed according to the Thien Ban character, while determining forward or reverse direction must be based on the Dia Ban character. This is the most confusing point for beginners, because on the same board the two layers follow two different ways.
Thien Tuong in favorable and unfavorable positions: why does the same star differ in good and bad?
Volume 1: Introduction states the principle: auspicious tuong can also be out of place, and inauspicious tuong can also be well placed. For example, Thanh long is originally auspicious, but if it falls into the Than palace on the Dia Ban it is considered out of place, called a broken-horned dragon, indicating bad omens. Conversely, Cau tran is originally inauspicious, but if it enters the Ty palace on the Dia Ban it is well placed, called casting a seal, indicating good omens. An auspicious tuong well placed gives very good omens, an inauspicious tuong out of place is very bad.
For the Quy nhan star, Volume 1: Introduction gives the full name Thien at quy nhan, belonging to Earth and yin Earth, its original position at Ky Suu in the northeast, gaining prosperity in the last eighteen days of each season, that is the last eighteen days of the third, sixth, ninth, and twelfth lunar months. The book describes Quy nhan sitting to the right outside the gate of the Tu vi palace, holding the leading position among generals and tasked with spreading blessings to the world, and in Luc Nham it is called the Son of Heaven. One notable technical detail: Quy nhan can sit on Thin or Tuat on the Dia Ban, but never rides Thin or Tuat on the Thien Ban.
However, the book Tuyen tap bai viet Tam Thuc chon loc number 8 (Thien Hoa Dong Nhan) stresses the practical side: when interpreting a chart, Quy nhan may not bring good. If Quy nhan is overcome by the Dia Ban, or has Chu Tuoc sitting above overcoming down to the Thien Ban, then even seeking help is hard to achieve. And when Quy nhan falls into the empty cycle, others' promises of help will not be kept, good news reported is false. This way of speaking complements the purely theoretical part in the introductory book: the star's position matters, but interaction within the chart decides.
Nguyet Tuong and methods to change it when reading multiple charts in the same hour
The Nguyet Tuong is the Sun's palace corresponding to the solar term, and the starting point for placing the Thien Ban. Volume 1: Introduction devotes a method called Hoan tuong phap, the method of changing the Nguyet Tuong, for the case where one person in the same hour wants to read another chart for a different matter. The principle is to keep the current hour palace to place on the Dia Ban, but change the Nguyet Tuong name, and one must know whether the current Nguyet Tuong is Yin or Yang because counting forward or backward, before or after, differs.
Volume 1: Introduction gives two groups of rules. For Yang days, count one at the Nguyet Tuong name of the previous chart and count along the twelve chi, but if changing for an even chart count backward four palaces, while for an odd chart count forward to the sixth palace. For Yin days, count one at the Dia Ban palace bearing the first chart's Nguyet Tuong, then count forward to the fifth or sixth Dia Ban palace, essentially choosing a Yang palace on the Dia Ban and placing the Nguyet Tuong on that Yang palace to make the second chart; from the third chart onward, count one at the Dia Ban palace bearing the previous chart's Nguyet Tuong, when moving for an odd chart count backward three palaces, when moving for an even chart count forward five palaces.
Volume 1: Introduction uses the example of a Giap Tuat day, Nguyet Tuong Dan, Than hour to illustrate both cases. This detail shows Luc Nham is not a simple formula, but a system with its own rules for repeated readings in the same hour.
Distinguishing Dai Luc Nham from finger-counting Tieu Luc Nham
The two share the name Luc Nham but differ in nature. Tieu Luc Nham is the folk finger-joint counting method, giving quick results by counting positions on six hand palaces, without building a twelve-palace Dia Ban, without Nguyet Tuong, without Tu Khoa and Tam Truyen. Dai Luc Nham is the opposite: its entire value lies in the multi-layered structure just presented, and to interpret one must go through Dia Ban, Thien Ban, Tu Khoa, Tam Truyen, and finally Thien Tuong.
The book Tuyen tap bai viet Tam Thuc chon loc number 8 (Thien Hoa Dong Nhan) lists a series of advanced Luc Nham topics such as Du Do, Huu Tuong Tu Khi, Thien Y khac Can and Can khac Thien Y, Can Chi Giao Khac and Giao Ho Tuong Sinh, Tam Truyen, Huyen Vu, Nguyet Tuong, Gian Truyen Khoa, Tam Hinh, Thanh Long, Mo Than, various Quy and Luc Hung Tang. This list shows Dai Luc Nham is a vast interpretive system, not a few finger taps.
Why is Dai Luc Nham grouped with the Tam Thuc?
The Tam Thuc consist of Thai At, Ky Mon Don Giap, and Luc Nham, each with its own focus. The book Tuyen tap bai viet Tam Thuc chon loc number 1 (Thien Hoa Dong Nhan), discussing Tam Thuc Ky Mon, mentions factors such as Yin Yang harmony, balance of the toan cuc, and completeness of the gates, and says that in Tam Thuc Ky Mon one can use calculations to grasp the wishes of the two sides, Guest and Host, toward each other. This is the common spirit of Tam Thuc: build a model of time and space to see relations between parties.
For Luc Nham, that model appears through four layers: fixed Dia Ban, Thien Ban rotating with Nguyet Tuong and hour, Tu Khoa drawn from the day's can chi, Tam Truyen unfolding the event, then Thien Tuong overlaid to qualify good and bad. The higher one goes, the more abstract, and the more interpretive experience is required.
Where should one begin learning Dai Luc Nham?
Following the order set by Volume 1: Introduction, beginners should firmly grasp the first four tasks: set the Dia Ban, place can, place chi, place Thien Ban. Only when these four are proficient should one learn to place the Tu Khoa, because Tu Khoa are taken directly from can chi and Thien Ban. Then come the nine methods to derive the Tam Truyen, and finally placing the twelve Thien Tuong.
A necessary reminder: Luc Nham is a system of symbols for reflecting on situations, not a guarantee of results. Learners should see it as a way to ask structured questions, not to replace practical decisions or bet on matters beyond their control.
