Born on March 21
A cusp birthday. In most years the Sun crosses from Pisces into Aries during March 21, so people born this day are one or the other depending on the hour. At noon UTC it's Aries in 100% of years.
Pisces or Aries? Check your year
The Sun's entry into Aries shifts by a few hours from year to year. Find your birth year, convert your birth time to UTC, and compare: born before the time shown, you're Pisces; after it, Aries. Years missing from the list had the crossing on a neighbouring day (the Sun was in one sign for the whole of March 21).
Not sure about the time zone or the minutes? Compute your chart — it does the conversion and settles the sign.
Your sign: Aries (or Pisces)
The first sign of the zodiac — initiator, fighter, and patron of fresh starts.
If your Sun is in Aries, your core identity is built around action. You feel most yourself when you're starting something — a project, a fight, a workout, a brand-new chapter. You hate stagnation more than you hate failure. The slow consensus-building meetings and the relationships that need careful tending? That's not where you shine. You shine in the opening move, the new venture, the moment someone needs to just decide already.
- ElementFire
- ModalityCardinal
- RulerMars
- SeasonMarch 21 – April 19
Full Aries guide → · What a Aries birth chart looks like → · Pisces guide →
Your decan: the first decan of Aries
Each sign is divided into three 10° decans, and each decan has a sub-ruler that shades the sign's core. Degrees 0–10 of Aries belong to Mars: your drive — how you take action, what makes you angry, and what you fight for. Read it as Aries with a Mars accent — the fire core is unchanged, the emphasis moves.
Two of Wands
Planning · Decisions · Discovery. The card assigned to this ten-degree slice of the zodiac — a birthday card in the same sense a sun sign is a birthday sign: one lens on the date, not a verdict.
Read the Two of Wands in full on My Day Check →What the date can't tell you
The Sun is one placement out of ten. Your Moon sign changes every two to three days, so Aries born on March 21 in different years have different Moons; your rising sign changes every two hours and needs a birth time and place. Those two carry most of what people mean by "personality" in a chart.
Or browse the twelve possibilities: Aries Sun with each Moon →
Classic matches for a March 21 birthday
By sun sign, Aries pairs most easily with Leo, Sagittarius, Gemini, Aquarius. Sun-sign compatibility is the coarse layer; the couple reading compares both full charts.
Common questions
Is March 21 Pisces or Aries?
Both are possible. On March 21 the Sun moves from Pisces into Aries in most years, at a time that ranges from 00:07 UTC to 04:38 UTC UTC across 1980–2030 (in some years the crossing falls on the neighbouring day). Convert your birth time to UTC and compare it with the crossing for your year in the table above — before it you're Pisces, after it Aries.
What zodiac sign is March 21?
March 21 is a cusp day between Pisces and Aries; at noon UTC it falls in Aries in 100% of years between 1980 and 2030. Your birth year and hour decide it.
What decan is March 21?
The first decan of Aries (0°–10°), sub-ruled by Mars. Decans divide each sign into three 10° slices; the sub-ruler adds a second flavour to the sign's core — here your drive — how you take action, what makes you angry, and what you fight for.
What tarot card is March 21?
In the Golden Dawn system each decan has a minor arcana card: for the first decan of Aries it is the Two of Wands (planning, decisions, discovery). It's a birthday card in the same way a sun sign is — one lens, not a verdict.
Does everyone born on March 21 have the same chart?
No. They share the Sun in Aries or Pisces, but the Moon changes sign every two to three days, the rising sign every two hours, and the outer planets by year. Two people born March 21 in different years can have almost nothing else in common in their charts.