Birthday signs · Aries season
What zodiac sign is March 21?
The noon UTC Sun places March 21 in Aries during 97 of the 101 years from 1930 to 2030, and in Pisces during 4. The noon Sun was found to range from 29.91° Pisces to 1.4° Aries on March 21. Which sign applies to March 21 rests on the birth year and time.
Calculated across 1930–2030 · checked .
March 21: Aries or Pisces
| Aries at noon UTC | 97 of 101 years |
|---|---|
| Pisces at noon UTC | 4 of 101 years |
| Pisces years include | 1931, 1935 and 1939 |
| Settled by | birth year and time |
March 21 at a glance
| Sign | ♈︎ Aries (97 years) or ♓︎ Pisces (4) |
|---|---|
| Element and mode | fire, cardinal |
| Polarity | positive (masculine) |
| Ruler | Mars (traditional) |
| Sun on this date | 29.9° Pisces to 1.4° Aries at noon UTC, 1930–2030 |
| Day of the season | Aries day 1 or 2; Pisces day 30 |
| Decan | first (0°–10°), face of Mars |
| Sidereal sign (Lahiri) | Pisces |
| Day number | 3 (modern numerology) |
Rulers: Ptolemy; modern list.6
The decan: early Aries
| Noon Sun | 29.91° Pisces to 1.4° Aries |
|---|---|
| Decan | first (0°–10°) |
| Face ruler, Chaldean order | Mars |
| Pisces years | 29.91°–30° Pisces |
Faces after Lilly, in Chaldean order.3
March 21 by the numbers
| Day number | 3 (2 + 1 = 3) |
|---|---|
| Month-day number | 6 (3 + 3) |
| System | modern numerology, digit sums |
Digit sums as numerology guides give them.4
Where the date falls in the season
| Day of Aries season | 1 or 2 (in its Aries years) |
|---|---|
| Day of Pisces season | 30 (in its Pisces years) |
| Aries season opened | March 20 (20 years) or March 21 (77) |
| Aries season closed | April 19 (69 years) or April 20 (28) |
| Element and mode | fire, cardinal |
| Traditional ruler | Mars |
Seasons by the noon-UTC rule; rulers after Ptolemy.2
Born at this point in Aries season
Someone born on March 21 arrives at the very start of Aries, when the sun has only just crossed into the sign. Their first instinct is to act before the plan is finished. A friend asks whether they are ready, and they answer by starting anyway, pulling the first thread and seeing what it reveals. Early in the season, that urgency feels like courage. Later, it can leave them standing alone at a half-built table, wondering why nobody else moved as fast.
Interpretation, not prediction.
The sidereal sign
| Sidereal sign, Lahiri ayanamsa | Pisces, all 101 years |
|---|---|
| Noon Sun, sidereal Pisces | 6.4°–7.8° |
| Convention | Indian (Vedic) astrology |
Ayanamsa convention.5
Born on March 21
- Johann Sebastian Bach (1685–1750), German composer
- Joseph Fourier (1768–1830), French mathematician and physicist
- Sergey Lavrov (1950), Russian politician of Armenian origin, Minister of Foreign Affairs
- Jair Bolsonaro (1955), 38th President of the Federative Republic of Brazil
- Gary Oldman (1958), British actor and filmmaker
- Ayrton Senna (1960–1994), Brazilian racing driver
- Ronaldinho (1980), Brazilian associaton fooball player
- Antoine Griezmann (1991), French footballer
Birth dates checked on Wikidata.7
March 21 in history
Observed on this date:
- Arbor Day (Lesotho)
- Arbor Day (Portugal)
- Early music
- Education Freedom Day
- Harmony Day (Australia)
- Human Rights Day (South Africa)
- Independence Day (Namibia)
- International Colour Day (International)
- International Day for the Elimination of Racial Discrimination (International)
- International Day of Forests (International), by proclamation of the United Nations General Assembly
Events on March 21:
- 630: Emperor Heraclius returns the True Cross, one of the holiest Christian relics, to Jerusalem.
- 1871: Otto von Bismarck is appointed as the first Chancellor of the German Empire.
- 1928: Charles Lindbergh is presented with the Medal of Honor for the first solo trans-Atlantic flight.
- 1970: The first Earth Day proclamation is issued by Joseph Alioto, Mayor of San Francisco.
- 2006: The social media site Twitter (now officially named X) is founded.
How the answer was worked out
Each year's sign was read from the Sun's tropical longitude on March 21, calculated at noon UTC for each year from 1930 through 2030 by Astronomy Engine.1 How the Machine works
Questions people also ask
What zodiac sign is March 21?
March 21 at noon UTC carries the sign Aries in most sampled years, specifically 97 of 101, and the sign Pisces in the other 4.
Is March 21 on a zodiac cusp?
Yes. The Sun in some years moved from Pisces into Aries during March 21, which is why the noon UTC sample divides into Aries in 97 years and Pisces in 4, the birth year and time settling the sign that applies.
What decan is March 21?
March 21 remains in the first decan of Aries (0°–10°) throughout every sampled year, so the face ruler under the Chaldean order is Mars.
What is the birthday number for March 21?
In modern numerology, the figures for March 21 are a day number of 3 and a month-day number of 6, 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 .
- Aries (astrology) — Wikipedia. Verified .
- Wikipedia: March 21 — Wikipedia (Wikimedia On this day feed); birth dates checked on Wikidata. Verified .