The foundation of I Ching number divination lies in the numerical correspondences of the Early Heaven Eight Trigrams: Qian (1), Dui (2), Li (3), Zhen (4), Xun (5), Kan (6), Gen (7), Kun (8). In Plum Blossom Numerology, any set of numbers can be reduced by dividing by 8 and taking the remainder to correspond to one of the trigrams. When the remainder is 0, it is treated as 8 (Kun). To cast a hexagram, you typically obtain two sets of numbers: one for the upper trigram and one for the lower trigram. Combining them forms a complete six-line hexagram called the "original hexagram." The genius of this method is turning everyday numbers into symbolic images. It's not just mechanical calculation—it embodies the I Ching's unity of "image, number, and principle," allowing the diviner to reflect on trends and patterns through the hexagram. It's a tool for cultural and philosophical contemplation.

Time-based divination is the most common application of number divination because time is always changing and easy to obtain. Traditionally, you use the lunar year, month, day, and hour. First, add the year (Earthly Branch ordinal), month, and day together, divide by 8, and take the remainder to get the upper trigram. Next, add the year, month, and day sum to the hour (Earthly Branch ordinal), divide the total by 8 to get the lower trigram. Finally, divide the total of all four items by 6 and take the remainder to determine the position of the "moving line," counting from the first line upward. The moving line is the key to interpretation—it indicates which line is changing in the hexagram. Through the moving line, the original hexagram gives rise to a "changed hexagram." The diviner then compares the two hexagrams to observe the evolution from the present situation to the future. This interconnected process showcases the I Ching's intricate design integrating time, space, and numbers.

After casting the original hexagram, moving line, and changed hexagram, you enter the interpretation phase. Plum Blossom Numerology emphasizes the "body-function" relationship: the hexagram without the moving line is called the "body hexagram," representing yourself or the core matter; the hexagram containing the moving line is the "function hexagram," representing the external environment or the question. The diviner analyzes the Five Elements interactions between body and function, combined with the hexagram text and line text, to gauge auspicious or inauspicious trends. However, it's important to note that I Ching number divination is culturally positioned as a tool for reflection and entertainment—it helps people see issues from a different angle and organize thoughts, not as absolute prophecy. Divination results should never be used for medical, investment, or legal decisions. Maintaining a rational and open mindset, treating the hexagram as an opportunity for self-reflection, is the healthiest and most rewarding way to engage with this traditional culture.