Birth Star Calendar
Do you know the star of your birthday? A birth star calendar assigns one real named star to each of the 366 days.
Our birth stars follow an astronomical rule: the star that culminates — crosses the southern meridian at its highest — around midnight on your date, chosen from IAU-named stars and compiled independently by our editorial team. On your birthday night, your star is really up there.
Browse by month or jump to your date. Find the star of your day.
All 366 days compiled — all 12 month pages live
Compiled data
- Days compiled
- 366
- Named stars
- 250
- Constellations
- 58
- Method
- Original
Browse by month
What is a birth star?
A birth star is the star assigned to your date of birth — one named star per day, enjoyed together with its star words.
It is a separate tradition from birthday colors: colors and stars both go by day, but the star is an actual named star in that night's sky. There is no official standard for birth stars, so sources differ.
We assign stars by one consistent astronomical rule: the star culminating around midnight on that date.
Our assignment rule
- ・Each date gets the star culminating around midnight (target RA = solar RA + 180°)
- ・Pool: 279 IAU-named stars brighter than magnitude 4.5
- ・A star appears at most twice; never on adjacent dates
- ・Star words are editorial, drawn from name etymology and constellation myths
- ・The rule and dataset are published in oureditorial policy
Birth stars vs colors and flowers
| Star | Color | Flower | |
|---|---|---|---|
| Unit | Day (366) | Day (366) | Day (366) |
| Method | Midnight culmination rule | Colorstrology system | Season and hanakotoba |
| Verify | Visible on your birthday night | HEX | Season |
FAQ
- Who decided the birth stars?
- There is no official standard for birth stars. Ours are assigned by an astronomical rule: the star that culminates around midnight on your date.
- Why do birth stars differ between sites?
- No unified table exists, so sources assign different stars to the same date. We publish one consistent, rule-based mapping.
- How is a birth star different from a zodiac sign?
- The zodiac divides the year into 12 signs. Birth stars go further: one actual named star for each of the 366 days.
- Can I really see my birth star?
- Almost always. Every star is brighter than magnitude 4.5 and culminates around midnight on its date. Circumpolar stars like Polaris stay up all night in the northern sky, and a few far-southern stars never rise over Japan — each day's page notes this.
- Is there a birth star for February 29?
- Yes. We assign a star to February 29 as well.