Numerology · Western astrology · Chinese zodiac
December 15 Birthday: Zodiac Sign, Personality and Numerology
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In Western astrology, a December 15 birthday falls in Sagittarius, in the third decan, with Jupiter as the sign's ruler and Sun as the decan's. In numerology the day gives birthday number 6. The Life Path also uses the birth year. Sagittarius is mutable and fire.
Key facts
| Sun sign | Sagittarius in every year from 1930 to 2030 |
|---|---|
| Decan | Sagittarius decan 3 (Sun) |
| Sun's position at noon UTC | About 23° Sagittarius |
| Sagittarius · element · modality · ruler | Fire · Mutable · Jupiter |
| Birthday number | 15 → 6 |
| Life Path by birth year | 1960: 7 · 1970: 8 · 1980: 9 · 1990: 1 · 2000: 11 · 2010: 3 · 2020: 4 |
| Chinese zodiac | After Lunar New Year, so the animal is the birth year's own |
| Born on this day | L. L. Zamenhof (1859), Antoine Henri Becquerel (1852), Gustave Eiffel (1832) |
December 15 zodiac sign and personality
With the Sun at twenty-three degrees of Sagittarius, December 15 gets the third decan's Leonine warmth, and fifteen reduces to 6, the number of family and responsibility. The combination is generous and heart-led. Interpretively, this birthday suits the person who turns every holiday into an occasion, insists on including newcomers and remembers everyone's favourite dish.
On December 15 the Sun usually sits at about 23° Sagittarius, in the third decan, where Sun is the sub-ruler alongside Jupiter. The Sun, ruler of Leo, governs the closing ten degrees of Sagittarius, from about December 12 to December 21. Here the Archer's idealism meets a warm, theatrical streak. Natives of this decan are often described as inspiring, expressive and happiest when sharing big ideas with an audience, whether in a classroom, on a stage or around a long dinner table. Pride and a wish for recognition may sit alongside their generosity. When this decan's fire is aimed at lifting others, it tends to make learning feel like a celebration rather than a lecture, and a crowd feel like a community.
December 15 in numerology
Born on the 15th, the compound 1 + 5 reduces to 6, so the birthday number is 6. Here the 1's self-reliance and the 5's curiosity pour into the 6's caring, responsible nature. People with this birthday are often described as warm, magnetic and generous, with an adventurous side that keeps their care from becoming heavy. They may be drawn to roles where they look after others while still having room to move, such as teaching, hosting or creative work for families. As a supporting influence, the 15th tends to show in a lively, affectionate presence.
The Life Path, the main number in a numerology chart, also uses the birth year, so it changes from one December 15 birthday to the next: it is 7 for 1960, 8 for 1970, 9 for 1980 and 1 for 1990, for example. Some birth years on this date reach the master number 11.
Born on December 15: season, famous birthdays and Chinese zodiac
December birthdays arrive at the start of northern winter, around the shortest days and the year's festivities, and at the start of summer in the southern hemisphere. Sagittarius holds most of the month, with Capricorn beginning around December 21 or 22. In numerology December is month 12, which reduces to 3: expression and sociability, built from the 1 and 2 of initiative and partnership. December 15 is the 349th day of the year (350th in a leap year). By December 22, 7 days later, the Sun has usually moved on into Capricorn.
For the Chinese zodiac, Lunar New Year has always passed by December 15, so the animal is simply the one for the birth year. Well-known people born on December 15 include L. L. Zamenhof (1859), Antoine Henri Becquerel (1852) and Gustave Eiffel (1832).
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 sign is December 15?
December 15 is Sagittarius in every year from 1930 to 2030, wherever you were born. It falls in the third decan of Sagittarius, which tradition links with Sun.
What is the Life Path number for someone born on December 15?
It depends on the birth year. On December 15 the Life Path is 7 in 1960, 8 in 1970, 9 in 1980, 1 in 1990, 11 in 2000, 3 in 2010 and 4 in 2020. The birthday number, from the day alone, is 6 for everyone born on the 15th.
What Chinese zodiac sign is someone born on December 15?
Chinese astrology is straightforward for a December 15 birthday: the new year began weeks earlier, so the birth year's own animal applies.
Which famous people were born on December 15?
December 15 is also the birthday of L. L. Zamenhof (1859), Antoine Henri Becquerel (1852) and Gustave Eiffel (1832). The list comes from Wikidata and favours people with the most Wikipedia articles.
Last updated October 23, 2026. Awaiting editorial review. Numerology and astrology are interpretive traditions for reflection, not predictions.