♈︎ Sun at ~10° Aries · second decan · Sun

March 31 zodiac sign: Aries, second decan

If you were born on March 31, your sign is Aries, the fire sign ruled by Mars: the Sun is in Aries on this date in every year from 1980 to 2030. The Sun sits about 10° into Aries on this date, in the second decan, where Aries's core takes on a Sun flavour. Here's what the date fixes, and what only your birth time can tell you.

Your sign: Aries

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.

The date fixes the Sun; the year and hour fix the rest. A Aries born March 31 with the Moon in Aries runs on a different inner weather from one with the Moon in Aries: see Aries Sun, Aries Moon. Your rising sign needs the birth time; the twelve Aries Sun combinations show what each one changes.

Aries dates, traits & compatibility → · What a Aries birth chart looks like →

In the US (2000–2014), an average of 10,776 babies were born on each March 31, rank 339 of 366 dates; Aries is number 8 of 12 signs (8.14%). What's the most common zodiac sign?

The Moon on March 31, 1980–2030

Across the 51 years from 1980 to 2030, the Moon at noon UTC on March 31 was most often in Taurus, Leo, Libra, Sagittarius, Capricorn, and Pisces (5 years each) and least often in Aries, Virgo, and Aquarius (3 years each). Unlike the Sun, the Moon sign depends on the birth year. On March 31, 2026, the Moon stays in Virgo the whole UTC day.

In 23 of those 51 years (45%) the Moon changed sign during March 31 itself, so in those years the birth time decides the Moon as well as the rising sign. Cells with an arrow mark them, with the UTC time of the change. The Moon was exactly full on March 31 in 1980, 1999, and 2018, and new in 1995.

Find your birth year. One sign means the Moon spent the whole UTC day there; an arrow means it changed sign that day, at the UTC time shown: born before it, the first sign; after it, the second. The Moon sign calculator settles it in seconds; your birth chart adds the rising sign and houses.

Times in UTC: a birth late in the evening in the Americas, or early in the morning in Asia, can fall on the neighbouring UTC date.

March 2026: full moon March 3, 2026, Virgo · new moon March 19, 2026, Pisces.

Your decan: the second 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 10–20 of Aries belong to Sun: the core of who you are — your conscious identity, your will, your essential self. Read it as Aries with a Sun accent — the fire core is unchanged, the emphasis moves.

March 31 sits on a decan boundary: in 12 of the 51 years from 1980 to 2030 the Sun spends part or all of the day (UTC) in the first decan of Aries (0°–10°), sub-ruled by Mars. Which one is yours depends on your birth year and time; a birth chart gives the exact degree.

Decan tarot card · Golden Dawn attribution

Three of Wands

Expansion · Foresight · Progress. 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 Three of Wands in full on My Day Check →

All the tarot cards for March 31: decan, sign, ruling planet and year card →

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 31 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.

Born March 31? Add your year, time and place

Your Moon and rising depend on the year and hour. Computed here in a few seconds — then your full chart with a preview of its reading, no sign-up.

Or browse the twelve possibilities: Aries Sun with each Moon → · just my Moon sign · how the free birth chart calculator works

Classic matches for a March 31 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

What zodiac sign is March 31?

March 31 is Aries, the cardinal fire sign ruled by Mars. The Sun sits at roughly 10° Aries on this date, in the second decan.

What decan is March 31?

The second decan of Aries (10°–20°), sub-ruled by Sun. Decans divide each sign into three 10° slices; the sub-ruler adds a second flavour to the sign's core — here the core of who you are — your conscious identity, your will, your essential self. March 31 sits on a decan boundary: in 12 of the 51 years from 1980 to 2030 the Sun spends part or all of the day (UTC) in the first decan of Aries (0°–10°), sub-ruled by Mars. Which one is yours depends on your birth year and time; a birth chart gives the exact degree.

What tarot card is March 31?

In the Golden Dawn system each decan has a minor arcana card: for the second decan of Aries it is the Three of Wands (expansion, foresight, progress). It's a birthday card in the same way a sun sign is — one lens, not a verdict.

What Moon sign is someone born on March 31?

It depends on the year, and in 45% of years on the hour too. For example: in 1980, Libra; in 1990, Gemini; in 2000, Aquarius; in 2010, Libra or Scorpio; in 2020, Gemini or Cancer. Over 1980–2030 the Moon on March 31 was most often in Taurus, Leo, Libra, Sagittarius, Capricorn, and Pisces. A birth time and place pin it down.

Does everyone born on March 31 have the same chart?

No. They share the Sun in Aries, 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 31 in different years can have almost nothing else in common in their charts.