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What is taegil (date selection)?
— what it means to choose a good day
Taegil (擇日, date selection) means choosing a day that fits your purpose. If Son-eomneun-nal is a standard that's the same for everyone, date selection also looks at your Saju and the nature of the task. That's why the same day can be good for a contract but not so great for moving.
In this article 5 topics
Taegil and Son-eomneun-nal are different things
People often use the two interchangeably, but their scope is different.
| Category | Son-eomneun-nal | Date selection |
|---|---|---|
| Basis | A single lunar date | Date × you × what you're planning |
| Person to person | Same for everyone | Differs |
| Depends on the task | Same | Differs |
| Mainly used for | Moving / travel | Weddings, contracts, openings, moving, surgery |
| Difficulty | Just a calendar | Requires Saju calculation |
Son-eomneun-nal is about direction. It only asks whether you can move in any direction that day. That makes it a good fit for moving, but it doesn't tell you enough for things that aren't about movement, like contracts or weddings.
Date selection goes further. It looks at who is doing it and what kind of task it is.
The three things date selection actually looks at
1. Does the day clash with you?
The first thing to check is clash (chung 沖). It's the relationship between characters that sit directly opposite each other among the twelve Earthly Branches, and days that clash head-on with your zodiac animal are avoided.
The six direct-clash pairs — Rat↔Horse · Ox↔Sheep · Tiger↔Monkey · Rabbit↔Rooster · Dragon↔Dog · Snake↔Pig
For example, if you were born in a Year of the Rabbit you avoid Rooster days, and if you were born in a Year of the Horse you avoid Rat days. It's one day in 12, so the chances of it actually getting in the way are low. Just keeping to this one rule gets you halfway to good date selection.
2. Does the day's tone fit the task?
This is the heart of date selection. Even on the same day, the favorable tone differs depending on what you're planning.
| What you plan to do | The tone you need | Well-matched Ten Gods |
|---|---|---|
| Contracts / settlements | Thoroughness, certainty | Direct Wealth · Direct Officer |
| Business openings / launches | Spreading out, people gathering | Eating God · Indirect Wealth |
| Job interviews / presentations | Expression lands well | Eating God · Hurting Officer |
| Moving | Stability, settling in | Direct Resource · Direct Wealth |
| Wedding | Bonding, harmony | Direct Officer · Direct Resource |
| Surgery / procedures | Clearing away, cutting off | Indirect Officer · Metal energy |
So the phrase "good day" isn't actually accurate. "A day that suits this task" is the right way to put it. A day that's good for a contract can be a bit flat for an opening.
3. Direction and time
For tasks that involve movement (moving, business trips, openings), look at Son-eomneun-nal and direction. When you can't choose the date, at least choose the time of day. Use the moment things begin as the reference point, such as signing the contract or the moving truck setting off.
Pick the date first and it usually fails
This is the most common mistake in date selection. If you pick out a good day first and then try to fit the contract, the moving company and the other person's schedule around it, it almost never works.
The order is the other way around: lock in the conditions you can't change first, then choose the best day within what's left. Date selection isn't a tool for creating candidates; it's a tool for choosing among candidates.
- Start with what you can't changeFinal-payment day, the other person's schedule, the period you can book.
- Confirm the range of possible datesIt usually comes to about 2–4 weeks.
- Select a date within that rangeRule out clash days and pick a tone that fits the nature of the task.
- Lock in the chosen day as an eventDon't stop here. It only means something if you can bring it up again as the day approaches.
An honest word about date selection
I won't tell you that date selection changes the outcome. It's not something that can be verified.
There is one thing you can actually confirm, though: the process of setting a date makes you take another look at the task itself. To choose a contract date, you end up rereading the contract terms; to choose a moving day, you end up checking the order of the final payment and the loan. That process cuts down on mistakes.
There's also the effect of getting your heart behind a date you've already set. Having the sense that "this is the day I chose" helps you stay steadier when it arrives. That's why Mutal Unnie built date selection not as a date lookup but as a feature that leads into adding an event.
Enter a date range and a purpose into Mutal Unnie's "Find a good day" and you'll get candidate dates; the day you choose becomes an event as is. As the day approaches, Unnie sums up the one thing to prepare and lets you know the evening before.
Next month's good day — choose it and save it
Contract, move, confession — pick a purpose and candidates appear.
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How is taegil different from Son-eomneun-nal?
Son-eomneun-nal is a directional concept set by the lunar date alone and the same for everyone. Taegil (date selection) also looks at your Saju and the nature of what you're planning. So the same day can be judged differently for each person and each task.
What if there are no good days at all?
If you look for a day that satisfies every condition, it's normal to end up with no candidates. Date selection isn't about finding the perfect day; it's about choosing a relatively better day within what's possible. If you narrow it down only by avoiding direct-clash days, you'll usually have some candidates.
Can I use date selection to set a surgery date too?
For surgery, your medical team's judgment and the hospital's schedule always come first. Delaying a recommended time because of date selection is risky. At most, use it as a reference when you're offered several dates to choose from.
What if the other person's good day differs from mine?
Traditionally, you either go by the person hosting the occasion or narrow it down to days that are not a direct clash for either of you. Trying to satisfy every favorable condition for both people leaves no candidates, so just avoiding what needs to be avoided is the realistic approach.