Birthdays · December

December 20 birthdayZodiac sign, famous birthdays, personality and your 2027 numbers

The short answer

December 20 is a Sagittarius birthday in the third decan of Sagittarius, one caveat aside for births far from Greenwich, with birthday number 2 and a Personal Year 7 in 2027; Kylian Mbappé (1998), Ashley Cole (1980) and Jaroslav Heyrovský (1890) were born on December 20 too.

Get my personal reading

$0 today, then $12/month after 7 days. Cancel anytime.

Born on December 20? Add your birth year

See your exact Life Path, your 2027 year and your Road.

December 20 zodiac sign: Sagittarius

Sun sign: Sagittarius
Sun at noon UTC: 27.7° to 29.1° Sagittarius
Decan: Third of Sagittarius, 20° to 30°
Element and mode: Fire, mutable
Ruling planet: Jupiter

At noon UTC on December 20 the Sun is in Sagittarius in every one of the 91 years from 1940 to 2030, between 27.7° and 29.1° of the sign, but in 5 of those years, most recently 2028, it went on into Capricorn within hours of the date’s end in UTC, so a birth late on December 20 in a time zone west of Greenwich, such as the Americas’, can already have the Sun in Capricorn. For a birth on December 20 the year, the time and the place settle the sign: convert the time of birth to UTC and compare it with the minute the Sun changed sign that year, or let the zodiac sign calculator do it from your date, time and city.

At noon UTC on December 20 the Sun is in the third decan of Sagittarius, 20° to 30°, in every one of those years, a face that belongs to Saturn in the Chaldean order and is read through Leo, ruled by the Sun, by triplicity; in most years the decan runs from December 12 to December 21, and December 20 is its ninth day.

In most years December 20 is the 29th day of the Sun’s season in Sagittarius, which runs from November 22 to December 21 counted at noon UTC, with one day of it still to come. December 20 is the 354th day of a common year and the 355th of a leap year, with 11 days of the year still to come after it.

From the reference page to your own chart

What does your own chart say about you?

Choose love, work or purpose. Your reading is written from your chart. Your reading uses your own birth details.

Get my personal reading $0 today, then $12/month after 7 days. Cancel anytime.

Walk through Alex’s whole example first

The Road of AgesSee the turning points of your whole life, from your birth date See your road's shape

Prefer to explore first?

Member tools The 2026 book Lectures

The daily letter, free

One short letter at 7 each morning: the day’s theme read for your own chart.

The Road of AgesThe turning points of your whole life, from your own chart Walk my road

Free, by email

Your daily Almanac letter

One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.

Famous December 20 birthdays

The earliest born of the twelve is John III of Sweden, in 1537, and the most recent Kylian Mbappé, in 1998; seven of them were born after 1949.

Born since 1950

Kylian Mbappé (born 1998), French association football player
Ashley Cole (born 1980), English association football player
Martín Demichelis (born 1980), Argentine footballer and coach
Jonah Hill (born 1983), American actor
Jorginho (born 1991), Brazilian and Italian association football player
Fabian Schär (born 1991), Swiss association football player
Andrea Belotti (born 1993), Italian association football player

Born from 1900 to 1949

Gigliola Cinquetti (born 1947), Italian singer

Born in the 1800s

Jaroslav Heyrovský (1890–1967), Czech chemist
Ferdinand Buisson (1841–1932), French academic and politician
Irene Dunne (1898–1990), American actress and singer

Born before 1800

John III of Sweden (1537–1592), Swedish king

Birthdays from Wikidata, checked against Wikipedia’s “On this day” births: the twelve best known of the 59 people the Almanac’s table keeps for December 20, by how many Wikipedia editions cover them, with dates before the calendar reform as the sources give them.

December 20 birthday personality

Saturn rules the last face of Sagittarius in the Chaldean scheme while Leo lends the Sun’s confidence, so belief is read here as conviction that has been tested: the teacher, the elder, the one whose principles have cost them something. Tradition warns against a certainty that stops listening.

The 20th is the 2 with a zero beside it, read in numerology as the partner’s number amplified: patience, tact and a gift for the long collaboration. In a fire sign the 2 is read as the loyal second, the friend whose courage shows most when someone they love is in trouble.

Where Sagittarius gives way to Capricorn the traveller meets the builder at the December solstice, vision meeting discipline. Some readers take a birthday this close to the change to carry something of both signs, a symbolic reading the calculation cannot measure; which sign the Sun was in at a birth is a matter of fact, settled by the year, the time and the place.

A question to carry from December 20: where would your hope grow stronger if it asked for help instead of carrying everything alone?

The Sun in Sagittarius and the number 2 are only part of the story: your Moon, your rising sign and the rest of your chart have as much to say, and the tradition offers all this as a mirror, never a verdict.

Birthday number 2

Born on the 20th, 2 + 0 = 2, so your birthday number is 2: a 2 vibration supports sensitivity, partnership, diplomacy, and careful listening, with relational intelligence and patience as its gift and over-dependence, passivity, or people-pleasing as its strain.

Your 2027 numbers

A Greek sphinx with a lion's body, folded wings and a serene woman's face, seated on a stone plinth, an engraving — The Sphinx, keeper of riddles

For a birthday on December 20 the house method reduces the birth month and the day on their own and adds the Universal Year of 2027, 11 (2 + 0 + 2 + 7 = 11, a master number kept whole), as it stands: December, the 12th month, reduces to 3, the 20th reduces to 2, and 3 + 2 + 11 = 16, which reduces to 7, so 2027 is your Personal Year 7. On the way it passes 16, a karmic debt number, read in a year as a lesson to work through rather than as bad luck.

A Personal Year 7 is numerology’s inward year, for study, prayer, rest and taking stock. With 2027 a Universal Year 11, it is read as a year when insight comes readily to anyone who listens for it.

Personal Months of 2027, a Personal Year 7: Jan 8 Feb 9 Mar 1 Apr 11 May 3 Jun 4 Jul 5 Aug 6 Sep 7 Oct 8 Nov 9 Dec 1

In 2027 December 20 falls on a Monday, the day the old reckoning gives to the Moon, and is a Personal Day 3 (1 + 20 = 21, then 3) in a Personal Month 1 (7 + 12 = 19, then 1), while April is a master month 11; the Personal Year itself turns on 1 January, not on the birthday.

December birthstone and birth flower

Birthstones: Turquoise, tanzanite and zircon
Birth flowers: Narcissus, and holly as the second flower

December’s turquoise, tanzanite and zircon come from the modern list (the Jewelers of America list of 1912, as since revised), and its narcissus and holly from The Old Farmer’s Almanac.

More birthdays

Common questions

What zodiac sign is December 20?

Sagittarius, almost always: at noon UTC on December 20 the Sun is in Sagittarius in every year from 1940 to 2030, but in 5 of those years, most recently 2028, it went on into Capricorn within hours of the date’s end in UTC, so a birth late on December 20 in a time zone west of Greenwich, such as the Americas’, can already have the Sun in Capricorn.

Is December 20 a cusp birthday?

Not in UTC: in no year from 1940 to 2030 does the Sun change sign during December 20 counted in UTC, though in 5 of those years, most recently 2028, it went on into Capricorn within hours of the date’s end in UTC, so a birth late on December 20 in a time zone west of Greenwich, such as the Americas’, can already have the Sun in Capricorn. The nearest cusp birthday is December 21, one day later.

Who was born on December 20?

Among the best known people born on December 20 are Kylian Mbappé (born 1998), Ashley Cole (born 1980) and Jaroslav Heyrovský (1890–1967), with Martín Demichelis, John III of Sweden and Jonah Hill and six more named on this page.

What is the birthday number for December 20?

2. Born on the 20th, 2 + 0 = 2, so your birthday number is 2: a 2 vibration supports sensitivity, partnership, diplomacy, and careful listening, with relational intelligence and patience as its gift and over-dependence, passivity, or people-pleasing as its strain.

What is the 2027 Personal Year for a December 20 birthday?

7. For a birthday on December 20 the house method reduces the birth month and the day on their own and adds the Universal Year of 2027, 11 (2 + 0 + 2 + 7 = 11, a master number kept whole), as it stands: December, the 12th month, reduces to 3, the 20th reduces to 2, and 3 + 2 + 11 = 16, which reduces to 7, so 2027 is your Personal Year 7. On the way it passes 16, a karmic debt number, read in a year as a lesson to work through rather than as bad luck.