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March

March 21 zodiac sign: Aries

Aries begins on March 21 by the printed calendar, which makes it the traditional first day of the zodiac year. Whether the equinox came before or after your birth depends on birth time and birth place, so the date can still be Pisces.

March 21 at a glance

Zodiac sign
♈ Aries
Element and modality
fire, cardinal
Ruling planet
Mars
Place in the sign
Day 1 of Aries; Taurus starts 30 days later on the calendar
Decan
1 of 3, ruled by Aries (March 21 to 30)
Cusp
Pisces to Aries
Birthday number
21 reduces to 3 (2 + 1 = 3)
March birthstone
Aquamarine, also Bloodstone

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The traditional first day of the zodiac year

Almanacs have long printed March 21 as the day the zodiac begins, because the equinox fell on or about it when the Gregorian calendar was fixed in 1582. The Sun's real crossing has since moved, which is why the number on your birthday card and the Sun's position can disagree by a day.

The date carries plenty of non-astrological weight. UNESCO observes World Poetry Day on March 21, and the United Nations marks the International Day of Forests the same day. Spring, in the northern sense, is the thread through all of it, and Aries is its sign.

Is March 21 a cusp date?

A March 21 birthday is the most literal Aries there is: a cardinal fire sign beginning on its own first day. Tradition reads the opening days as directness, quick starts and a dislike of waiting, with the nearest sign, Pisces, hardly visible. It still pays to check the year, time and place of birth, since the date can be Pisces.

The standard table gives Aries. The change from Pisces into Aries can reach March 21 in some year and time zone within 2000 to 2050, so a birth on this date can belong to either sign.

Across 2000 to 2050 (51 years) the Sun entered Aries on these UTC dates: March 20 in 47, March 19 in 2, March 21 in 2.

Within those years the entry into Aries fell on March 19 between 22:30 and 23:20 UTC; on March 20 between 00:10 and 23:20 UTC; on March 21 between 00:10 and 01:00 UTC. Clocks in populated time zones run from UTC-10 to UTC+12, so the same instant can read as the day before or the day after, and your birth time and birth place decide which side of it you were born.

The next three times the Sun enters Aries, in UTC. Computed from our own ephemeris, accurate to about fifteen minutes; an almanac gives the exact minute.
YearSun enters Aries
2027about Mar 20, 20:30 UTC
2028about Mar 20, 02:10 UTC
2029about Mar 20, 08:00 UTC

Born near that moment? The sun sign calculator takes your year, time and time zone.

The Aries decan for March 21

March 21 falls in decan 1 of Aries, March 21 to 30, ruled by Aries. Each sign is cut into three decans of about ten days, ruled in turn by the sign itself and the next two signs of its element.

Aries keeps its first decan for itself, so Mars carries these days without a second voice. That is the pure version of the sign in the decan tradition: energetic, competitive, focused on the next thing. Decan rulers vary by system, and this is the triplicity one.

Birthday number 3 for March 21

The day 21 reduces to 3: 2 + 1 = 3. No step lands on a master number.

A 21 birthday reduces to 3 (2 + 1), and the month number here is also 3, so the date reads as a repeated 3. In numerology repetition is taken as emphasis; threes are tied to expression and the social side of life. Card XXI of the tarot, The World, closes the Major Arcana, and 3/21 opens the astrological year, which is a pleasing mirror if you like patterns.

The March birthstone

Birthstones follow the month and not the day, so a birthday on March 21 shares Aquamarine (also Bloodstone) with every other March birthday. See March birthstones.

March 21 zodiac questions

Does March 21 always start Aries?

Yes on the standard calendar. If the equinox arrived after your birth moment that day, the Sun was still in Pisces; the table here shows how often that has happened.

Why is March 21 called the first day of the zodiac?

Because it was the equinox date when the calendar was fixed. The Sun's real crossing has since shifted to March 20 in the period we measure, but the printed date stayed.

What does a March 21 birthday number mean?

The day reduces to 3, and numerologists link 3 with expression and sociability. It is a reading from the numerology tradition, not part of the horoscope.

Dates next to March 21

Other March dates with their own page: March 19, March 20.

A birthday date is one piece of the chart

Our astrologers read the Moon, rising sign, houses and transits that a date cannot show.

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