May 31 Zodiac Sign: Gemini
The short answer
People born on May 31 are Gemini. On this date the Sun sits between 8.7° Gemini and 11.0° Gemini in every year from 1950 to 2025, in the first decan of Gemini.
May 31 at a glance
| Zodiac sign | Gemini (May 21 to June 20) |
|---|---|
| Sun position, 1950 to 2025 | 8.7° Gemini to 11.0° Gemini (usually 9.8° Gemini at noon UTC) |
| Decan | first decan of Gemini: Gemini (triplicity), Jupiter (Chaldean), Eight of Swords (Golden Dawn); second decan of Gemini: Libra (triplicity), Mars (Chaldean), Nine of Swords (Golden Dawn) |
| Element | Air |
| Modality | Mutable |
| Ruling planet | Mercury |
| Nearest sign change | About 8.9 days away |
What a May 31 birthday means
On May 31 the Sun sits between 8.7° Gemini and 11.0° Gemini in every year from 1950 to 2025, counting every hour of the day in UTC. Its usual noon position is 9.8° Gemini.
That places May 31 in the first decan of Gemini. The modern triplicity system gives this decan to Gemini, the older Chaldean order gives it to Jupiter, and the Golden Dawn tradition pairs it with the Eight of Swords. In some years the Sun moves on into the second decan of Gemini during this date, so both apply.
Gemini is an air sign of the mutable modality, ruled by Mercury. Air signs think in conversations and connections; ideas are how they move. Mutable signs adapt: each one closes a season and gets ready for the next.
May 31 is about 9 days from the nearest sign change, so the Sun is in Gemini on this date in every year charted.
Where these figures come from
The Sun's position was charted at 12:00 UTC on every day from 1950 to 2025, and the start and end of each date were placed on the straight line between neighbouring days, which is exact to a small fraction of a degree. The range covers every hour of May 31 in UTC across all 76 years; someone born far from UTC can sit up to about half a degree beyond it. Decans follow two traditional systems: the triplicity system, which gives each third of a sign to the three signs of its element in turn, and the older Chaldean order of faces, which runs through the seven classical planets from Mars at the start of Aries.
Other birthdays
May: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Born on May 31? Vera reads the whole chart, not just the Sun.
Your Sun sign is one line of your chart. Vera casts the rest from your birth time and place, then answers what you actually want to know.