May 31 zodiac sign
May 31 brings the Sun to about 9° Gemini, the last degree of the Mercury decan, with the bright fixed star Aldebaran close by and the Venus decan just ahead.
Sun signGemini
- Sun at 8°–12° Gemini
- 1st decan · Mercury
- On the star Aldebaran
May 31 in profile
Nine degrees is the final step of Gemini’s first decan, where Mercury rules both sign and sub-sign and the air sign is at its most quicksilver. Some years carry the Sun over into the second decan already, sub-ruled by Venus through Libra, which softens the edge with tact. Traditional astrology links Aldebaran, the watcher of the east, with integrity. A May 31 Gemini tends to combine sharp wit with a firm sense of fair play.
Courage shows in speaking up. They are the one who asks the awkward question in a staff meeting, challenges a lazy argument or calls a company to complain on a friend’s behalf. Bodily danger appeals less than social daring: a new city, a stage, a new field of work. Fear tends to show as chatter, but they usually act anyway, quickly, before the doubt can grow.
In conflict they argue with words, fast and precisely, and can win a debate while losing the person. They see both sides, which helps them find compromises, yet they may also switch positions mid-argument just to test an idea. Anger flares and fades within the hour. The useful habit is to slow down, say what actually hurt, and listen to the answer before reaching for a clever reply.
Gemini all day
In every year from 1930 to 2040 the Sun was in Gemini for the whole of May 31, in every time zone. This is not a cusp birthday: the nearest changes of sign fall around May 22 and June 20.
Your Moon sign depends on the year
The Sun is in the same place on May 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 May 31 in recent years, from 00:00 to 23:59 UTC (an arrow means it changed sign during the day).
- 2017Leo → Virgo
- 2018Sagittarius → Capricorn
- 2019Aries → Taurus
- 2020Virgo → Libra
- 2021Aquarius
- 2022Gemini
- 2023Libra → Scorpio
- 2024Pisces
- 2025Leo
- 2026Sagittarius
Compatible signs for a Gemini
Sun-sign compatibility starts from the element. Gemini gets on most easily with its own element and with the two sextile signs, and feels the strongest pull from its opposite. The full charts decide how a real pairing feels.
A gift for a May 31 birthday
A ticket to a live debate, a lecture with questions from the floor or a theatre evening with a talk afterwards, somewhere their opinions have room to play.
Asked about May 31
What zodiac sign is May 31?
May 31 is Gemini in every year: the Sun is at about 8°–12° Gemini that day, in the sign’s 1st decan.
Is May 31 a cusp birthday?
No. The Sun is well inside Gemini on May 31. The cusp days, when the Sun changes sign, fall around May 22 and June 20. Astrology has no blended cusp signs anyway: at any moment the Sun is in one sign.
What decan is May 31?
May 31 falls in the 1st decan of Gemini. In the triplicity system we use, that decan belongs to Gemini and its ruler Mercury, which colours the Gemini Sun with a little of Gemini. In some years the Sun crosses into the next decan during the day.
Your birthday is only the Sun
A May 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.