Numerology · Western astrology · Chinese zodiac
December Birthdays: Zodiac Signs, Decans and Numerology for Every Day
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In Western astrology, December birthdays fall under Sagittarius and Capricorn. In most years December birthdays from the 1st to the 21st are Sagittarius, and from the 22nd they are Capricorn. December 20, December 21, December 22 and December 23 are cusp dates. In numerology December is month 12, which reduces to 3.
Key facts
| Sun signs (most years) | Sagittarius Dec 1–21 · Capricorn Dec 22–31 |
|---|---|
| Cusp dates | Dec 20, Dec 21, Dec 22, Dec 23 |
| Month number | 12 → 3 |
| Days | 31 |
| Chinese zodiac | The birth year's own animal (Lunar New Year has passed) |
Zodiac signs and decans in December
December opens on the final day of Sagittarius' first decan, where Jupiter is doubled, and moves on December 2 into the second, where Mars as sub-ruler gives the Archer extra drive and daring. Around December 12 the third decan begins, and the Sun lends Sagittarius warmth and a flair for inspiring others. Then, around December 21 or 22, at the solstice, the Sun enters Capricorn. The shift from mutable fire to cardinal earth is one of the clearest of the year: from wandering to climbing, from big ideas to the plan that makes them real. The last days of December sit in Capricorn's first decan, where Saturn rules twice. December birthdays often hold both moods, the free spirit and the steady builder, and the year's end gives them a natural reason to weigh one against the other.
In most years December birthdays from the 1st to the 21st are Sagittarius, and from the 22nd they are Capricorn. The cusp dates, where the sign can differ by year or time zone, are December 20, 21, 22 and 23; each has its own page explaining both possibilities. Decan by decan, the month opens in the first decan of Sagittarius, linked with Jupiter, from the 2nd the second decan of Sagittarius, linked with Mars, from the 12th the third decan of Sagittarius, linked with Sun and from the 22nd the first decan of Capricorn, linked with Saturn.
December birthdays in numerology and the Chinese zodiac
December is month 12, which numerology reduces to 1 + 2 = 3, the number of creativity, communication and joy. The compound is often read as a story in itself: the 1 of the individual and the 2 of partnership combining into expression. That makes the month's numerology feel social and warm, well suited to the season. December birthdays follow the calendar year's Chinese animal. Under Four Pillars reckoning the Rat month starts around December 7 with the solar term Major Snow, so most December birthdays carry the Rat in the month pillar. The Rat is traditionally associated with quick wits, resourcefulness and a keen eye for opportunity. Next to Sagittarius' optimism and Capricorn's ambition, it suggests someone who notices the opening and moves first.
Every page for a December date lists the Life Path for several birth years, because the year changes the total even when the day stays the same.
Famous December birthdays
Each December page lists the best-known people born on that date, drawn from Wikidata and ranked by how many Wikipedia language editions have an article about them. A sample across the month: Pablo Escobar (December 1), Rainer Maria Rilke (December 4), Noam Chomsky (December 7), Emily Dickinson (December 10), Taylor Swift (December 13), Jane Austen (December 16), Édith Piaf (December 19), Basshunter (December 22), Justin Trudeau (December 25), Woodrow Wilson (December 28) and Henri Matisse (December 31). Sharing a birthday with someone well known says nothing about a life's direction, but it is a pleasant way into the date's sign, decan and numbers, which each page then explains in turn. The lists favour people with a precisely recorded birth date in the modern Gregorian calendar, so some much-celebrated figures from earlier centuries are missing.
Read together
One tradition on its own gives a single angle. A Unified Reading puts your Life Path and name numbers, your Sun sign (plus Moon and rising when you know your birth time), your Chinese zodiac animal and your life stage side by side, and points out where they agree and where they pull apart. See how that looks in the fictional sample reading, or start with the free preview and pay $4.99 once only if you want the full reading.
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Frequently asked questions
What zodiac signs are December birthdays?
In most years December birthdays from the 1st to the 21st are Sagittarius, and from the 22nd they are Capricorn. The cusp dates, where the sign can differ by year or time zone, are December 20, 21, 22 and 23; each has its own page explaining both possibilities.
What is the numerology number of December?
December is month 12, which reduces to 3. The month is one of three parts of the Life Path calculation, with the day and the year.
Which Chinese zodiac animal is someone born in December?
Lunar New Year has always passed by December, so a December birth takes the animal of the calendar birth year.
Last updated October 23, 2026. Awaiting editorial review. Numerology and astrology are interpretive traditions for reflection, not predictions.