December 21 Birthday
Zodiac sign, birthstone, birth flower and more for everyone born on December 21.
The zodiac sign for December 21 is
Sagittarius
Sagittarius runs November 22 – December 21. December 21 is day 30 of 30 in Sagittarius season, in the 3rd decan.
December 21 is on the Cusp of Prophecy (Sagittarius–Capricorn).
The Sun changes sign at a slightly different time each year, so some people born on December 21 are actually Capricorn. A birth chart with your birth year, time and place gives the exact answer.
Birthstone
Turquoise
Also Tanzanite, Zircon
Birth flower
Narcissus (paperwhite)
Also holly
Ruling planet
Jupiter
Decan ruler: Sun
How common
#55 of 366
11,727 US births a year
Day of the year
Day 355
Day 356 in a leap year
December 21 zodiac sign: Sagittarius
Sagittarius is ruled by Jupiter, the planet of growth and luck. The Archer is linked with travel, big ideas, freedom and a cheerful, blunt honesty.
| Symbol | ♐ Archer |
|---|---|
| Dates | November 22 – December 21 |
| Element | Fire |
| Modality | Mutable |
| Ruling planet | Jupiter |
| Traits | adventurous, optimistic, honest, independent |
| Strengths | Generous, funny, open-minded and curious about the world. |
| Weaknesses | Tactless, restless and impatient with routine. |
| Opposite sign | Gemini |
| Most compatible with | Aries, Gemini, Leo, Libra, Aquarius |
The 3rd decan of Sagittarius
Each sign is split into three decans of about ten days. December 21 falls in the 3rd decan, which is co-ruled by Sun, the planet of Leo. Astrologers say this adds a touch of Leo (confident, generous) to the Sagittarius personality.
December 21 birthstone: Turquoise, Tanzanite and Zircon
Everyone born in December shares the same birthstones, and you can pick whichever you like.
| Stone | Color | Hardness (Mohs) | Said to symbolize |
|---|---|---|---|
| Turquoise | Sky blue to green | 5–6 | Good fortune and protection |
| Tanzanite | Violet-blue | 6–7 | Transformation and calm |
| Zircon | Blue (most popular), clear or brown | 6–7.5 | Wisdom, honor and prosperity |
December 21 birth flower: Narcissus (paperwhite) and Holly
- Narcissus (paperwhite): good wishes and hope
- Holly: protection and domestic happiness
How common is a December 21 birthday?
December 21 is the 55th most common birthday in the US out of 366. An average of 11,727 babies were born on it each year from 1994 to 2014, 5% more than on an average day.
Based on US birth records, 1994–2014. See every date ranked.
What day of the week was December 21?
Here’s the day of the week December 21 fell on each year, and the Chinese zodiac animal for someone born that day.
| Birth date | Day of the week | Chinese zodiac |
|---|---|---|
| December 21, 2030 | Saturday | Metal Dog |
| December 21, 2029 | Friday | Earth Rooster |
| December 21, 2028 | Thursday | Earth Monkey |
| December 21, 2027 | Tuesday | Fire Goat |
| December 21, 2026 | Monday | Fire Horse |
| December 21, 2025 | Sunday | Wood Snake |
| December 21, 2024 | Saturday | Wood Dragon |
| December 21, 2023 | Thursday | Water Rabbit |
| December 21, 2022 | Wednesday | Water Tiger |
| December 21, 2021 | Tuesday | Metal Ox |
| December 21, 2020 | Monday | Metal Rat |
| December 21, 2019 | Saturday | Earth Pig |
| December 21, 2018 | Friday | Earth Dog |
| December 21, 2017 | Thursday | Fire Rooster |
| December 21, 2016 | Wednesday | Fire Monkey |
| December 21, 2015 | Monday | Wood Goat |
| December 21, 2014 | Sunday | Wood Horse |
| December 21, 2013 | Saturday | Water Snake |
| December 21, 2012 | Friday | Water Dragon |
| December 21, 2011 | Wednesday | Metal Rabbit |
| December 21, 2010 | Tuesday | Metal Tiger |
| December 21, 2009 | Monday | Earth Ox |
| December 21, 2008 | Sunday | Earth Rat |
| December 21, 2007 | Friday | Fire Pig |
| December 21, 2006 | Thursday | Fire Dog |
| December 21, 2005 | Wednesday | Wood Rooster |
| December 21, 2004 | Tuesday | Wood Monkey |
| December 21, 2003 | Sunday | Water Goat |
| December 21, 2002 | Saturday | Water Horse |
| December 21, 2001 | Friday | Metal Snake |
| December 21, 2000 | Thursday | Metal Dragon |
| December 21, 1999 | Tuesday | Earth Rabbit |
| December 21, 1998 | Monday | Earth Tiger |
| December 21, 1997 | Sunday | Fire Ox |
| December 21, 1996 | Saturday | Fire Rat |
| December 21, 1995 | Thursday | Wood Pig |
| December 21, 1994 | Wednesday | Wood Dog |
| December 21, 1993 | Tuesday | Water Rooster |
| December 21, 1992 | Monday | Water Monkey |
| December 21, 1991 | Saturday | Metal Goat |
| December 21, 1990 | Friday | Metal Horse |
| December 21, 1989 | Thursday | Earth Snake |
| December 21, 1988 | Wednesday | Earth Dragon |
| December 21, 1987 | Monday | Fire Rabbit |
| December 21, 1986 | Sunday | Fire Tiger |
| December 21, 1985 | Saturday | Wood Ox |
| December 21, 1984 | Friday | Wood Rat |
| December 21, 1983 | Wednesday | Water Pig |
| December 21, 1982 | Tuesday | Water Dog |
| December 21, 1981 | Monday | Metal Rooster |
| December 21, 1980 | Sunday | Metal Monkey |
| December 21, 1979 | Friday | Earth Goat |
| December 21, 1978 | Thursday | Earth Horse |
| December 21, 1977 | Wednesday | Fire Snake |
| December 21, 1976 | Tuesday | Fire Dragon |
| December 21, 1975 | Sunday | Wood Rabbit |
| December 21, 1974 | Saturday | Wood Tiger |
| December 21, 1973 | Friday | Water Ox |
| December 21, 1972 | Thursday | Water Rat |
| December 21, 1971 | Tuesday | Metal Pig |
| December 21, 1970 | Monday | Metal Dog |
| December 21, 1969 | Sunday | Earth Rooster |
| December 21, 1968 | Saturday | Earth Monkey |
| December 21, 1967 | Thursday | Fire Goat |
| December 21, 1966 | Wednesday | Fire Horse |
| December 21, 1965 | Tuesday | Wood Snake |
| December 21, 1964 | Monday | Wood Dragon |
| December 21, 1963 | Saturday | Water Rabbit |
| December 21, 1962 | Friday | Water Tiger |
| December 21, 1961 | Thursday | Metal Ox |
| December 21, 1960 | Wednesday | Metal Rat |
| December 21, 1959 | Monday | Earth Pig |
| December 21, 1958 | Sunday | Earth Dog |
| December 21, 1957 | Saturday | Fire Rooster |
| December 21, 1956 | Friday | Fire Monkey |
| December 21, 1955 | Wednesday | Wood Goat |
| December 21, 1954 | Tuesday | Wood Horse |
| December 21, 1953 | Monday | Water Snake |
| December 21, 1952 | Sunday | Water Dragon |
| December 21, 1951 | Friday | Metal Rabbit |
| December 21, 1950 | Thursday | Metal Tiger |
| December 21, 1949 | Wednesday | Earth Ox |
| December 21, 1948 | Tuesday | Earth Rat |
| December 21, 1947 | Sunday | Fire Pig |
| December 21, 1946 | Saturday | Fire Dog |
| December 21, 1945 | Friday | Wood Rooster |
| December 21, 1944 | Thursday | Wood Monkey |
| December 21, 1943 | Tuesday | Water Goat |
| December 21, 1942 | Monday | Water Horse |
| December 21, 1941 | Sunday | Metal Snake |
| December 21, 1940 | Saturday | Metal Dragon |
More about December 21
| Season (Northern Hemisphere) | Winter |
|---|---|
| Day of the year | 355 (356 in a leap year) |
| Days left in the year | 10 (10 in a leap year) |
Want your exact age or a countdown? Try the age calculator on our sister site Day Count Box.
December 21 birthday questions
- What zodiac sign is December 21?
- People born on December 21 are Sagittarius (♐), the Archer. Sagittarius season runs from November 22 – December 21.
- What is the birthstone for December 21?
- The birthstone for December 21 is the December birthstone: turquoise, tanzanite and zircon.
- What is the birth flower for December 21?
- December’s birth flowers are the narcissus (paperwhite) and holly.
- Is December 21 on a cusp?
- Yes. December 21 falls in the Cusp of Prophecy, between Sagittarius and Capricorn. Because the Sun changes sign at a slightly different time each year, people born on December 21 in some years are Capricorn. Check a birth chart with your exact birth year, time and place to be sure.
- How rare is a December 21 birthday?
- December 21 is the 55th most common birthday in the US out of 366. An average of 11,727 babies were born on it each year from 1994 to 2014, 5% more than on an average day.
- What day of the year is December 21?
- December 21 is day 355 of the year, or day 356 in a leap year.