♑︎ Sun at ~9° Capricorn · first decan · Jupiter

December 31 zodiac sign: Capricorn, first decan

If you were born on December 31, your sign is Capricorn, the earth sign ruled by Saturn: the Sun is in Capricorn on this date in every year from 1980 to 2030. The Sun sits about 9° into Capricorn on this date, in the first decan, where Capricorn's core takes on a Jupiter flavour. Here's what the date fixes, and what only your birth time can tell you.

Your sign: Capricorn

The cardinal earth sign that plays the long game and refuses to be flashy about it.

A Capricorn Sun is built around discipline and long-term thinking. You're the friend who actually executed on the plan everyone else was just talking about. You don't need praise for doing what you said you'd do — that's just baseline integrity to you. People often underestimate Capricorns at twenty-five and overestimate everyone else; by forty, the curve catches up, and the people who took you for slow find out you were just consistent.

The date fixes the Sun; the hour fixes the rest. A Capricorn born December 31 around sunset has Cancer rising, and a different first impression from one born at dawn. Your rising sign needs the birth time; the twelve Capricorn Sun combinations show what each one changes.

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

In the US (2000–2014), an average of 10,549 babies were born on each December 31, rank 348 of 366 dates; Capricorn is number 12 of 12 signs (7.63%). What's the most common zodiac sign?

The Moon on December 31, 1980–2030

Across the 51 years from 1980 to 2030, the Moon at noon UTC on December 31 was most often in Aries, Cancer, and Scorpio (6 years each) and least often in Gemini, Leo, Libra, Capricorn, and Pisces (3 years each). Unlike the Sun, the Moon sign depends on the birth year. On December 31, 2026, the Moon stays in Libra the whole UTC day.

In 21 of those 51 years (41%) the Moon changed sign during December 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 December 31 in 1990, 2009, and 2028, and new in 1986 and 2005.

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.

December 2026: full moon December 24, 2026, Cancer · new moon December 9, 2026, Sagittarius.

Your decan: the first decan of Capricorn

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 Capricorn belong to Jupiter: where you grow, where you find meaning, and where life tends to be generous to you. Read it as Capricorn with a Jupiter accent — the earth core is unchanged, the emphasis moves.

December 31 sits on a decan boundary: in 41 of the 51 years from 1980 to 2030 the Sun spends part or all of the day (UTC) in the second decan of Capricorn (10°–20°), 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

Two of Pentacles

Balance · Adaptability · Juggling. 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 Pentacles in full on My Day Check →

All the tarot cards for December 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 Capricorns born on December 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 December 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: Capricorn Sun with each Moon → · just my Moon sign · how the free birth chart calculator works

Classic matches for a December 31 birthday

By sun sign, Capricorn pairs most easily with Taurus, Virgo, Scorpio, Pisces. Sun-sign compatibility is the coarse layer; the couple reading compares both full charts.

Common questions

What zodiac sign is December 31?

December 31 is Capricorn, the cardinal earth sign ruled by Saturn. The Sun sits at roughly 9° Capricorn on this date, in the first decan.

What decan is December 31?

The first decan of Capricorn (0°–10°), sub-ruled by Jupiter. Decans divide each sign into three 10° slices; the sub-ruler adds a second flavour to the sign's core — here where you grow, where you find meaning, and where life tends to be generous to you. December 31 sits on a decan boundary: in 41 of the 51 years from 1980 to 2030 the Sun spends part or all of the day (UTC) in the second decan of Capricorn (10°–20°), 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 December 31?

In the Golden Dawn system each decan has a minor arcana card: for the first decan of Capricorn it is the Two of Pentacles (balance, adaptability, juggling). 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 December 31?

It depends on the year, and in 41% of years on the hour too. For example: in 1980, Libra or Scorpio; in 1990, Gemini or Cancer; in 2000, Pisces; in 2010, Scorpio; in 2020, Cancer or Leo. Over 1980–2030 the Moon on December 31 was most often in Aries, Cancer, and Scorpio. A birth time and place pin it down.

Does everyone born on December 31 have the same chart?

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