Born Mar 21 – Mar 30
Aries · first decan · Aries at full volume
Your decan
The first decan of Aries is the sign with nothing diluting it — double Mars, pure ignition. You're the most headlong, impulsive, fearless slice of Aries, the one who moves before the thought finishes forming. There's no brake pedal in here, only gas.
What sets your third apart
Because Mars rules both the sign and this decan, there's no second planet to soften the edge or add patience. It makes you a genuine force — and the most prone of the three Aries decans to burning out, picking fights, and starting nine things to finish none.
Your gift
Raw nerve and initiative no one can teach — you go when everyone else hesitates.
Your watch-out
No internal governor; you mistake every impulse for a calling and sprint until you crash.
The exact degrees, and who rules them
A decan is a third of a sign: ten degrees of zodiac, not a mood. Yours is Aries 0°00′ to 9°59′ — the first ten degrees the Sun crosses on its way through Aries, roughly Mar 21 – Mar 30 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) | Mars | The baseline Aries everyone shares |
| Chaldean face | Mars | drive and confrontation |
| Triplicity decanate | Mars | drive and confrontation |
Both surviving decan systems agree here, which is not the usual case — the Chaldean faces and the triplicity decanates both hand this stretch to Mars. When they agree, the sub-flavour is about as well attested as decan theory gets.
Read either way, the point is the same: urgency — this third of the sign starts sooner and argues quicker than the other two.
How it actually shows up
The decan is a modifier, not a second sign. It shifts emphasis inside Aries rather than replacing it — so everything true of Aries is still true of you, with drive and confrontation turned up. Three places people notice it:
- Under pressure. A Aries sun typically escalates — volume up, patience gone. In this third that reaction takes its colour from Mars — drive and confrontation is what the reaction ends up being about.
- In how you start things. The first decan sits at the front of the sign, where its qualities are least diluted and most raw.
- Next to the other two. Compare it directly: the second decan (Mar 31 – Apr 9) runs on Sun, and the third decan (Apr 10 – Apr 19) runs on Jupiter. 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.