Birthday signs · Sagittarius season
What zodiac sign is December 18?
December 18 lies in the sign Sagittarius of the tropical zodiac. The Sun was in Sagittarius at noon UTC on December 18 in all 101 years from 1930 through 2030, at 25.61° to 27.1° Sagittarius. Day 26 or 27 of Sagittarius season, in its late part, is December 18, with the element fire.
Calculated across 1930–2030 · checked .
December 18 is Sagittarius
| Sagittarius at noon UTC | 101 of 101 years, 1930–2030 |
|---|---|
| Nearest change of sign | at least 2 days away |
| Birth time needed for the sign | no |
December 18 at a glance
| Sign | ♐︎ Sagittarius, the Archer |
|---|---|
| Element and mode | fire, mutable |
| Polarity | positive (masculine) |
| Ruler | Jupiter (traditional) |
| Sun on this date | 25.6° to 27.1° Sagittarius at noon UTC, 1930–2030 |
| Day of the season | day 26 or 27 of Sagittarius season |
| Decan | third (20°–30°), face of Saturn |
| Sidereal sign (Lahiri) | Sagittarius |
| Day number | 9 (modern numerology) |
Rulers: Ptolemy; modern list.6
The decan: late Sagittarius
| Noon Sun | 25.61° to 27.1° Sagittarius |
|---|---|
| Decan | third (20°–30°) |
| Face ruler, Chaldean order | Saturn |
Faces after Lilly, in Chaldean order.3
December 18 by the numbers
| Day number | 9 (1 + 8 = 9) |
|---|---|
| Month-day number | 3 (3 + 9 = 12, then 1 + 2 = 3) |
| System | modern numerology, digit sums |
Digit sums as numerology guides give them.4
Where the date falls in the season
| Day of Sagittarius season | 26 or 27 |
|---|---|
| Sagittarius season opened | November 22 (48 years) or November 23 (53) |
| Sagittarius season closed | December 20 (5 years) or December 21 (82) or December 22 (14) |
| Element and mode | fire, mutable |
| Traditional ruler | Jupiter |
Seasons by the noon-UTC rule; rulers after Ptolemy.2
Born at this point in Sagittarius season
Born in the final days of Sagittarius, this person feels the pull of open roads and big ideas, but the late-season steadiness asks for a plan too. Picture someone who books a flight on impulse, then spends the next week checking passport dates and saving bills. The wanderlust gets its turn. The structure is what lets the trip happen at all, and they are slowly learning that both can live in the same week.
Interpretation, not prediction.
The sidereal sign
| Sidereal sign, Lahiri ayanamsa | Sagittarius, all 101 years |
|---|---|
| Noon Sun, sidereal Sagittarius | 2.1°–3.5° |
| Convention | Indian (Vedic) astrology |
Ayanamsa convention.5
Born on December 18
- J. J. Thomson (1856–1940), British physicist
- Archduke Franz Ferdinand of Austria (1863–1914), heir presumptive to the throne of Austria-Hungary
- Joseph Stalin (1878–1953), politician and leader of the Union of Soviet Socialist Republics from 1924 to 1953
- Willy Brandt (1913–1992), German politician (SPD), chancellor of West Germany (1969–1974) and Nobel Peace Prize laureate
- Steven Spielberg (1946), American filmmaker
- Brad Pitt (1963), American actor
- Christina Aguilera (1980), American singer, songwriter and actress
- Billie Eilish (2001), American singer-songwriter
Birth dates checked on Wikidata.7
December 18 in history
Observed on this date:
- International Migrants Day
- National Day (Qatar)
- Republic Day (Niger)
- UN Arabic Language Day (United Nations)
Events on December 18:
- 1118: The city of Zaragoza is conquered by king Alfonso I of Aragon from the Almoravid.
- 1878: The Al-Thani family become the rulers of the state of Qatar.
- 1935: The Lanka Sama Samaja Party is founded in Ceylon.
- 1999: NASA launches into orbit the Terra platform carrying five Earth Observation instruments, including ASTER, CERES, MISR, MODIS and MOPITT.
- 2022: Argentina win the FIFA World Cup final, defeating title holders France 4–2 on penalties following a 3–3 draw after extra time.
How the answer was worked out
The sign of each year from 1930 through 2030 was read from the Sun's tropical longitude on December 18, calculated at noon UTC with Astronomy Engine.1 How the Machine works
Questions people also ask
What zodiac sign is December 18?
Each of the 101 sampled years from 1930 to 2030 puts December 18 in Sagittarius, counting the Sun at noon UTC.
Is December 18 on a zodiac cusp?
No. On every December 18 from 1930 to 2030, the noon Sun was in Sagittarius, and December 18 sits at least 2 days from the nearest change of sign.
What decan is December 18?
Every sampled year finds December 18 within the third decan of Sagittarius (20°–30°), and the face ruler in the Chaldean order is accordingly Saturn.
What is the birthday number for December 18?
For December 18, modern numerology gives a day number of 9 and a month-day number of 3, each found by adding digits.
Sources
- Astronomy Engine JavaScript reference — Don Cross, Astronomy Engine. Verified .
- Ptolemy, Tetrabiblos, Book I — LacusCurtius, University of Chicago. Verified .
- Decan (astrology): the faces of the planets (after Lilly) — Wikipedia. Verified .
- Life Path Number — Numerology.com (practitioner site). Verified .
- Ayanamsa (Lahiri and other sidereal conventions) — Wikipedia. Verified .
- Sagittarius (astrology) — Wikipedia. Verified .
- Wikipedia: December 18 — Wikipedia (Wikimedia On this day feed); birth dates checked on Wikidata. Verified .