March 31 zodiac sign
March 31 brings the Sun to about 10° Aries, the threshold of the second decan, where Leo joins the sign and the Sun becomes sub-ruler, adding flair to the Mars drive.
Sun signAries
- Sun at 9°–12° Aries
- 2nd decan · Sun
March 31 in profile
Ten degrees is the point where Aries settles into its typical self, and the second decan gives it a Leo colour: Leo as sub-sign, the Sun as sub-ruler, fire meeting fire with more warmth and showmanship. The Leo note can be fainter in years when the Sun has not quite reached 10°. A March 31 Aries is bold, warm and theatrical, with the confidence to lead and a real wish to be admired for doing it with style.
Their entrance is noticed. They tell a story with their hands, laugh loudly and make strangers feel included within minutes. First impressions are bright and generous, sometimes a little much for quieter people. They remember names and use them, which wins people over. Underneath the performance sits real sincerity, and those who get past the first meeting usually find a loyal and open-hearted friend.
Creativity is expressive and public. They enjoy anything with an audience: karaoke, amateur theatre, cooking a showpiece dinner for twelve, organising a quiz night and hosting it in costume. Play is competitive and joyful; they want to win but also want everyone to have fun. Praise fuels them. The useful habit is making something purely for themselves now and then, with no audience, to keep the joy their own.
Aries all day
In every year from 1930 to 2040 the Sun was in Aries for the whole of March 31, in every time zone. This is not a cusp birthday: the nearest changes of sign fall around March 21 and April 19.
Your Moon sign depends on the year
The Sun is in the same place on March 31 every year; the Moon is not. It changes sign every two and a half days, so people who share this birthday can have any of the twelve Moon signs. Here is where it was on March 31 in recent years, from 00:00 to 23:59 UTC (an arrow means it changed sign during the day).
- 2017Taurus → Gemini
- 2018Libra
- 2019Aquarius
- 2020Gemini → Cancer
- 2021Scorpio
- 2022Pisces → Aries
- 2023Leo
- 2024Sagittarius
- 2025Taurus
- 2026Virgo
Compatible signs for an Aries
Sun-sign compatibility starts from the element. Aries gets on most easily with its own element and with the two sextile signs, and feels the strongest pull from its opposite. For a March 31 birthday, in the Leo decan, Leo is a natural match. The full charts decide how a real pairing feels.
A gift for a March 31 birthday
A ticket to a live show with great seats, or a stage experience like an improv class or a karaoke room booked for their friends, with them as host.
Asked about March 31
What zodiac sign is March 31?
March 31 is Aries in every year: the Sun is at about 9°–12° Aries that day, in the sign’s 2nd decan.
Is March 31 a cusp birthday?
No. The Sun is well inside Aries on March 31. The cusp days, when the Sun changes sign, fall around March 21 and April 19. Astrology has no blended cusp signs anyway: at any moment the Sun is in one sign.
What decan is March 31?
March 31 falls in the 2nd decan of Aries. In the triplicity system we use, that decan belongs to Leo and its ruler Sun, which colours the Aries Sun with a little of Leo. In some years the Sun crosses into the next decan during the day.
Your birthday is only the Sun
A March 31 birthday tells you where the Sun was. The Moon, the Rising sign and eight more planets each sit somewhere of their own, and they depend on the year, the hour and the place. The free calculator shows all of them.