The World of the 64 Hexagrams — Reading Change Through Yin-Yang and the Eight Trigrams

A single trigram alone cannot capture all the complex changes of the world. So the I Ching stacks the trigrams two at a time, above and below. Pairing eight upper trigrams with eight lower trigrams yields 8×8 — that is, 64 hexagrams. These 64 hexagrams symbolize every possible phase of situations that can arise in the world. Just as Qian carries firm strength and Kun gentle yielding, each hexagram holds its own unique name and meaning.

A single hexagram is made of six lines (yao) — six horizontal strokes. From bottom to top, from the first line to the top line, each line represents one of six stages in how a situation unfolds. When casting a divination, one reads the present situation and the coming flow through the changing line (the moving line) among these six. This is why an I Ching interpretation is not a fixed answer but something closer to counsel that points out the direction of change.

This site does not lay out all 64 hexagrams; instead it casts a single trigram by the year-month-day method (起卦) of the Meihua Yishu and uses it as the trigram of the day. The arithmetic is simple: convert today to the lunar calendar, add the order number of that year's branch (from 子1 to 亥12), the lunar month and the lunar day, and match the remainder of that sum divided by 8 to the Early Heaven number. October 7, 2026 is the 27th day of the 8th month of the lunar 丙午 year, so adding 7 for 午, 8 for the month and 27 for the day gives 7 + 8 + 27 = 42, and dividing 42 by 8 leaves 2, so the trigram of the day is 兌 (Lake). A remainder of 0 counts as 8 and gives 坤, and unlike the full method, the site does not add the hour to find a lower trigram and a moving line, so the result is one of eight trigrams rather than one of 64 hexagrams. Because it is cast from the date alone, everyone who visits on the same day sees the same trigram, and that "today" follows the local date of the device you use.

The same arithmetic applied to your date of birth gives your birthday trigram: May 15, 1990 is the 21st day of the 4th month of the lunar 庚午 year, so 7 + 4 + 21 = 32, which divided by 8 leaves 0, making it 坤 (Earth). The "generating and controlling of body and use" in the Meihua Yishu compares the elements of two trigrams and reads use giving birth to body, or the two being the same, as favourable, body overcoming use as slightly favourable, body giving birth to use as giving energy away, and use overcoming body as unfavourable. This site puts the trigram of the day in the place of use and the birthday trigram in the place of body, so when 兌 (Metal) of October 7, 2026 meets this birthday trigram 坤 (Earth), Earth gives birth to Metal, which is "body generates use" (體生用). For this person, then, that day reads as one of giving their energy outward, closer to a reminder to keep room for rest in proportion to what they spend. In the traditional full method, the body is chosen not from a birthday but from the upper and lower trigrams cast together at the moment of divination, so using the birthday trigram as the body is the approach this site chose so that the same day's trigram shines differently on each person.

In the year-month-day method the sum grows by 1 each time the lunar date moves forward a day, so the trigram of the day usually advances one step at a time along the Early Heaven order 乾·兌·離·震·巽·坎·艮·坤. For example, October 7, 2026 gives 兌, the 8th 離 and the 9th 震, but on October 10, the 1st day of the 9th lunar month, the sum drops to 7 + 9 + 1 = 17, so the trigram jumps to 乾 instead of moving on to 巽. The same happens when the lunar year turns: the day after 坤 on February 5, 2027 is the lunar New Year on February 6, when the branch changes to 未 and the sum becomes 8 + 1 + 1 = 10, giving 兌. The line that divides the years here is the lunar New Year, not Ipchun, so February 4, 2027 is Ipchun but still the 28th day of the 12th month of the lunar 丙午 year, and the 7 of 午 is used as before. This differs from "this year" in Saju and the zodiac reading, which follow Ipchun, so early in the year the day on which the year turns can differ from module to module even within the same site, so if two screens speak of different years, this difference is the first thing to recall.

The I Ching is often taken for a book of prophecy that predicts the future, but what a trigram speaks of is not a fixed event but the place you stand in now and the conduct that suits it. This site's trigram of the day is calculated from the date rather than chosen at random, so it does not change on the same day, no matter how many times or by whom the page is opened. It is also worth knowing that what you see here is a single trigram, so its scope differs from readings that carry over the judgements and line texts of the 64 hexagrams as they are. Even on a day when the birthday trigram and the trigram of the day meet as "unfavourable", the site means it not as a verdict that things will go wrong but as a signal to look once more, since the day's energy tends to press on your own ground. In the end, the trigram of a day is useful not as an answer that decides what to do but as a question to take out in a moment of hesitation.

The I Ching is not a book of prophecy that fixes the future, but a mirror of wisdom that prompts reflection on where you stand and which way to go. To dwell on the symbolism of the hexagram you cast and to ask, 'Where am I right now, and how should I conduct myself?' is the proper way to approach the I Ching. Today it is also enjoyed in a simple form — casting a single trigram from the date to gain the flow and counsel of the day.