Open a Chinese calendar app and you will see characters like 宜 (Yi, “suitable”) and 忌 (Ji, “avoid”) beside activities — travel, haircuts, contracts, weddings. If you are new to the culture, it looks like a personal horoscope. Usually it is not. It is lunar almanac logic: the recommendation is tied to the civil day’s stem-and-branch, shared by millions of people.
This page explains how to read Yi / Ji, how that differs from BaZi charting, and where Peng Zu taboos on the same page differ — see Yi/Ji vs Peng Zu taboos. Almanac data comes from lushn.one.
Almanac Yi / Ji: about the day, not about you
| Almanac Yi / Ji | BaZi charting | |
|---|---|---|
| Based on | Today’s day pillar | Your birth year, month, day, and hour pillars |
| Same for everyone that day? | Yes | No |
When a friend says “the almanac says today is bad for signing contracts,” they mean the left column — a public timing hint. When a BaZi app comments on your wealth star or annual luck, that is the right column and needs your birth data. For a fuller side-by-side, see Lunar almanac vs BaZi calendar.
What Yi and Ji actually list
- Day stem-branch (日干支), e.g., a Jia-Wu day.
- Yi (宜): activities considered harmonious with that day’s qi in folk tradition.
- Ji (忌): activities to postpone or handle carefully.
- Often also: directional stars, clash animals, lunar mansions — depending on the publisher.
Modern software (including lushn.one almanac builders) reconstructs these lists from established tables rather than improvising per user.
Why the same day shows the same Yi / Ji for everyone
Almanac rules key off the day on Earth, not your birth chart. That is why two strangers see identical “avoid ocean travel” lines on the same date. It is community rhythm, not a personalized verdict on your life.
Heavenly stems on the calendar: not yet “your” BaZi
Seeing 天干地支 on a wall calendar teaches vocabulary used everywhere in East Asian timekeeping. Learning four pillars is learning how your birth moment snapshots those cycles.
Wearables and the almanac
Occasionally a gift ties to today’s day element color: “wear Metal tones on a Geng day.” That is festive color play for the day, not a health regimen. Deeper personalization uses your stored pillars on the match flow or read five-element wearables — not the public Yi list alone.
Beginner FAQ
- Should I plan weddings only on “Yi: marriage” days?
- Many families still consult almanacs out of respect for elders. Practically, venue availability matters too. Treat Yi/Ji as cultural reference.
- How is Peng Zu different from Yi / Ji?
- Same page, different table. See Yi/Ji vs Peng Zu taboos.