Born Dec 12 – Dec 21
Sagittarius · third decan · The philosopher who needs an audience
Your decan
The third decan of Sagittarius takes Jupiter's wandering hunger and focuses it through a Sun-Leo lens. You're the most magnetic, purposeful, and vision-driven of the Sagittarians — you don't just chase the horizon, you want to stand on it with everyone watching. The search for meaning here doubles as a search for significance.
What sets your third apart
The Sun, by way of Leo, gives this decan a need to be seen that plain Sagittarius never had to deal with. Your ideas aren't just yours to explore — they're a performance, a mission, a legacy in the making. That can make you genuinely inspiring or genuinely exhausting, depending on whether your conviction is powered by truth or by applause.
Your gift
The rare combo of vision and magnetism — you make the big idea feel personal and urgent to everyone in the room.
Your watch-out
You mistake the spotlight for the destination; when no one's watching, the philosophy quietly stalls.
The exact degrees, and who rules them
A decan is a third of a sign: ten degrees of zodiac, not a mood. Yours is Sagittarius 20°00′ to 29°59′ — the third ten degrees the Sun crosses on its way through Sagittarius, roughly Dec 12 – Dec 21 in most years. Sun-sign dates shift by up to a day between years because the tropical year is not a whole number of days, so if you were born within about 24 hours of either end, run the actual chart rather than trusting a date table.
| Tradition | Ruler | What it governs |
|---|---|---|
| Sign ruler (all three decans) | Jupiter | The baseline Sagittarius everyone shares |
| Chaldean face | Saturn | structure, limits and time |
| Triplicity decanate | Sun | identity and vitality |
The two systems disagree, which is normal and worth knowing: the Chaldean faces run the seven classical planets in speed order straight through all 36 decans without regard to sign boundaries, while the triplicity decanates give the first third of every sign to its own ruler and then step through the other signs of the same element. Most popular astrology quotes the triplicity ruler (Sun) without saying so; the older Sagittarius face here is Saturn.
Read either way, the point is the same: visibility — this third wants the thing it does to be recognisably its own.
How it actually shows up
The decan is a modifier, not a second sign. It shifts emphasis inside Sagittarius rather than replacing it — so everything true of Sagittarius is still true of you, with identity and vitality turned up. Three places people notice it:
- Under pressure. A Sagittarius sun typically leaves the room, literally or not. In this third that reaction takes its colour from Sun — identity and vitality is what the reaction ends up being about.
- In how you start things. The third decan sits at the end of the sign, already leaning toward what comes next.
- Next to the other two. Compare it directly: the first decan (Nov 22 – Dec 1) runs on Jupiter, and the second decan (Dec 2 – Dec 11) runs on Mars. Same sign, three noticeably different settings.
What it is not: a personality test, and not something to weigh against your Moon or rising, both of which say considerably more about you than a third of your sun sign does. The big three is where to look next.
Your decan is a hint. Your chart is the answer.
The decan refines your sun sign — but your moon, rising and every planet are where the real story lives. Run your full birth chart, free.
Degree ranges are exact by definition (each decan is ten degrees of zodiac); the calendar dates shift by up to a day between years. Rulerships are the classical Chaldean face and triplicity decanate assignments, both stated above. Written and reviewed by the Zodiux editorial team · Last reviewed · How Zodiux computes your chart · Editorial standards · For reflection and entertainment, not advice.