The Chinese Almanac: Reading Yi and Ji

The Chinese almanac (黄历, huang li) gives each day a pillar, a set of activities marked yi (宜, suitable) and ji (忌, avoid), and several symbolic indicators. It is the most widely used form of traditional date selection.

What a daily entry contains

• Day pillar — the day's stem and branch, the same as the day pillar in BaZi.
• Lunar date and the current solar term.
• Twelve day officers (建除十二神): Establish, Remove, Full, Balance, Stable, Initiate, Destruction, Danger, Success, Receive, Open, Close. Each has traditional associations; Remove favours cleaning and medical matters, Destruction is generally avoided for major starts.
• Yi and ji lists — activities such as moving, signing, travel, weddings or construction.
• Clash (冲) — the day's branch clashes one of the twelve branches; people with that year branch are traditionally advised to be cautious that day.

How yi and ji are derived

The lists come from combining the day officer, the day pillar's relation to the month, and a large set of auspicious and inauspicious day spirits (神煞). Different almanac editions weigh these slightly differently, which is why two almanacs can disagree on a minor activity.

Using the almanac sensibly

1. Start with your own constraints — availability, weather, logistics.
2. Check the day's clash against your own year and day branches from your BaZi chart.
3. Prefer days where your activity is in yi and avoid days where it is in ji.
4. Don't over-optimise. A good-enough day chosen calmly is better than a perfect day that adds stress.

Solar terms and month

The almanac month changes at the jie solar term, the same boundary used for BaZi months — see solar terms and BaZi months.

The twelve day officers in detail

The day officers (建除十二神) rotate through the days in a fixed order. The cycle is anchored so that the day whose branch matches the month branch is the Establish (建) day; at each jie solar term one officer repeats, which keeps the cycle aligned with the month. Their traditional associations are:

Because the officers depend on the month branch, the same calendar date in different months carries a different officer.

Day spirits (神煞)

Behind the yi and ji lists sit dozens of day spirits. Some are favourable, such as 天德 (Heavenly Virtue) and 月德 (Monthly Virtue), which traditionally soften difficulties. Others are unfavourable, such as 月破 (Month Breaker, the day branch clashing the month branch). Almanac compilers combine these with the day officer to decide whether each activity is listed as yi or ji. You do not need to memorise them; it is enough to know that the lists are the result of a rule system, not arbitrary choices.

Clash and the person

Each day's branch clashes one of the twelve branches: a 午 day clashes 子, a 寅 day clashes 申, and so on. Almanacs traditionally print this as a warning for people whose year branch matches. In BaZi terms, the year branch is only one of four; a careful approach also checks whether the day clashes your day branch, which is the more personal position. Your branches are shown in the BaZi calculator and the full clash table is in the combinations and clashes guide.

A worked approach to choosing a date

Suppose you need to choose a moving day within a two-week window.

1. List the dates that work practically.
2. Open each in the almanac tool and note whether moving (搬家 or 入宅) appears in yi or ji.
3. Remove dates whose branch clashes your day branch or year branch.
4. Prefer dates with officers such as 成, 开 or 定 if several remain.
5. Choose among the rest on practical grounds.

This method takes ten minutes and respects both tradition and practicality.

Almanac and BaZi: how they relate

The almanac's day pillar is the same sexagenary day used in BaZi, and its month follows the same solar terms. The difference is purpose: BaZi describes a birth moment, the almanac describes the quality of a day for activities. Some practitioners combine them by preferring days whose elements support a person's useful element; this is an extension rather than standard almanac practice.

Limits

Almanac indications are traditional conventions. They are useful for cultural events — weddings, openings, family gatherings — where many people value an auspicious date. They should not override safety, health or legal timing, and no date guarantees an outcome.

Frequently asked questions

Why do two almanacs disagree? Different editions use different sets of day spirits and weightings.

Does the almanac use the lunar month? Yi and ji depend on the solar-term month; the lunar date is printed for reference.

Is a 破 day always bad? It is avoided for beginnings but is traditionally suitable for demolition and ending things.

Common activities and how they appear

Almanacs use short traditional labels. Some of the most frequent, with their usual meaning:

When an activity you need is not listed in either yi or ji, almanacs generally treat it as neutral for that day. Readers unfamiliar with these terms can use the almanac tool, which shows translations alongside the original labels.

A note on 黄道 and 黑道 days

Many almanacs also mark days as 黄道 ("yellow path", favourable) or 黑道 ("black path", less favourable), based on a separate cycle of twelve spirits such as 青龙, 明堂, 天刑 and 朱雀. This classification is independent of the day officers, so a 成 day can still be a 黑道 day. Compilers weigh both when producing the yi/ji lists; you only need to know that a single label is never the whole story.

A worked example: reading one day

Suppose the almanac shows a 甲子 day in a 寅 month, with the day officer 开 (Open). Reading it step by step:

1. Day pillar: 甲子 — wood over water. In a 寅 month wood is in season, so the day's stem is strong.
2. Officer: 开 is traditionally favourable for openings and starting work.
3. Clash: the day branch 子 clashes 午. People whose year or day branch is 午 might choose another day for important matters.
4. Yi list: might include 开市, 出行, 纳采; ji list: might include 动土 if certain day spirits are present.
5. Your chart: if your useful element is wood or water, the day's elements also suit you; if your Day Master is 庚 or 辛 metal, 甲 wood is your Wealth — practitioners might read the day as suited for business matters.

The final step is optional and goes beyond standard almanac use, but it shows how the almanac and BaZi can work together. You can view any day this way with the almanac tool and compare it with your chart from the BaZi calculator.

Why the same date differs by month

Because the day officers start from the month branch, the same day pillar can carry different officers in different months. A 甲子 day in a 子 month is an Establish (建) day, while in a 寅 month it is an Open (开) day. This is why almanac entries cannot be copied from one year to the next by date alone.

Key points

• Each almanac day has a day pillar, a lunar date, a solar term, a day officer, a clash and lists of yi (suitable) and ji (avoid).
• The twelve day officers start from the month branch and repeat one officer at each jie, so the same date carries a different officer in different months.
• Yi and ji lists come from combining the day officer with many day spirits. Editions weigh these differently.
• 黄道 and 黑道 days are a separate classification, and a single label is never the whole story.
• The day's clash is traditionally checked against your year branch. Checking your day branch as well is a more personal approach.
• Choose dates in this order: practical constraints, then clash, then yi/ji, then officer.
• Almanac months follow the same jie boundaries as BaZi months.
• Use the almanac for cultural occasions. It should not override safety, health or legal timing.

A ten-minute check with the almanac tool is enough for most occasions. Spending longer rarely improves the choice, and calm planning matters more than finding a perfect date.

Key terms in this article

Solar Terms · 二十四节气

The twenty-four solar terms divide the sun's path into 15° steps. The twelve 节 (jie) terms such as 立春 and 惊蛰 begin BaZi months; the twelve 中气 terms such as 雨水 mark mid-months. Each term has a precise astronomical moment, not just a date.

Branch Clash · 地支六冲

Branches opposite each other clash: 子午, 丑未, 寅申, 卯酉, 辰戌, 巳亥. A clash shakes both branches and their hidden stems. Clashes from luck or annual pillars to the day or month branch are traditionally watched closely.

Sexagenary Cycle · 六十甲子

Pairing the ten stems with the twelve branches in order (yang with yang, yin with yin) gives sixty combinations, from 甲子 to 癸亥. The same cycle counts years, months, days and hours, which is why every pillar is one of these sixty pairs.

Try the almanac tool for any date.