Born on May 21
A cusp birthday. In most years the Sun crosses from Taurus into Gemini during May 21, so people born this day are one or the other depending on the hour. At noon UTC it's Gemini in 92% of years.
Taurus or Gemini? Check your year
The Sun's entry into Gemini shifts by a few hours from year to year. Find your birth year, convert your birth time to UTC, and compare: born before the time shown, you're Taurus; after it, Gemini. Years missing from the list had the crossing on a neighbouring day (the Sun was in one sign for the whole of May 21).
Not sure about the time zone or the minutes? Compute your chart — it does the conversion and settles the sign.
Your sign: Gemini (or Taurus)
The mutable air sign that lives by language — quick to learn, quick to pivot, quick to bore.
A Gemini Sun makes a mind that genuinely runs faster than most. You learn quickly, talk quickly, and link ideas across domains in a way that surprises specialists. Your gift is the connection — between two unrelated fields, between two people who'd never meet without you, between an old idea and a new use for it. You're a natural translator.
- ElementAir
- ModalityMutable
- RulerMercury
- SeasonMay 21 – June 20
Full Gemini guide → · What a Gemini birth chart looks like → · Taurus guide →
Your decan: the first decan of Gemini
Each sign is divided into three 10° decans, and each decan has a sub-ruler that shades the sign's core. Degrees 0–10 of Gemini belong to Jupiter: where you grow, where you find meaning, and where life tends to be generous to you. Read it as Gemini with a Jupiter accent — the air core is unchanged, the emphasis moves.
Eight of Swords
Restriction · Self-imposed limits · Anxiety. The card assigned to this ten-degree slice of the zodiac — a birthday card in the same sense a sun sign is a birthday sign: one lens on the date, not a verdict.
Read the Eight of Swords in full on My Day Check →What the date can't tell you
The Sun is one placement out of ten. Your Moon sign changes every two to three days, so Geminis born on May 21 in different years have different Moons; your rising sign changes every two hours and needs a birth time and place. Those two carry most of what people mean by "personality" in a chart.
Or browse the twelve possibilities: Gemini Sun with each Moon →
Classic matches for a May 21 birthday
By sun sign, Gemini pairs most easily with Libra, Aquarius, Aries, Leo. Sun-sign compatibility is the coarse layer; the couple reading compares both full charts.
Common questions
Is May 21 Taurus or Gemini?
Both are possible. On May 21 the Sun moves from Taurus into Gemini in most years, at a time that ranges from 00:18 UTC to 15:06 UTC UTC across 1980–2030 (in some years the crossing falls on the neighbouring day). Convert your birth time to UTC and compare it with the crossing for your year in the table above — before it you're Taurus, after it Gemini.
What zodiac sign is May 21?
May 21 is a cusp day between Taurus and Gemini; at noon UTC it falls in Gemini in 92% of years between 1980 and 2030. Your birth year and hour decide it.
What decan is May 21?
The first decan of Gemini (0°–10°), sub-ruled by Jupiter. Decans divide each sign into three 10° slices; the sub-ruler adds a second flavour to the sign's core — here where you grow, where you find meaning, and where life tends to be generous to you.
What tarot card is May 21?
In the Golden Dawn system each decan has a minor arcana card: for the first decan of Gemini it is the Eight of Swords (restriction, self-imposed limits, anxiety). It's a birthday card in the same way a sun sign is — one lens, not a verdict.
Does everyone born on May 21 have the same chart?
No. They share the Sun in Gemini or Taurus, but the Moon changes sign every two to three days, the rising sign every two hours, and the outer planets by year. Two people born May 21 in different years can have almost nothing else in common in their charts.