If you were born on May 21, your zodiac sign is Géminis. The Sun occupies approximately 1° Géminis on this date, placing you in the 1st decan ruled by Mercury.
Análisis de Cúspide
Born on May 21, you sit at the edge of the Taurus-Gemini cusp (The Cusp of Energy). While your Sun is technically in Géminis, the influence of the neighboring sign is already prominent. The cusp spans May 19–23.
Learn more about The Cusp of Energy →Best Compatibility for May 21
♊ & ♎
Géminis & Libra
View compatibility →
♊ & ♒
Géminis & Aquarius
View compatibility →
♊ & ♈
Géminis & Aries
View compatibility →
Fellow air signs Libra and Aquarius speak Gemini's language of ideas, social connection, and intellectual freedom. Aries brings bold energy and exciting spontaneity that keeps Gemini perpetually fascinated and engaged.
Your Decan: 1st Decan of Géminis
Each zodiac sign spans 30° of the ecliptic, divided into three decans of 10° each. Born on May 21 at approximately 1° Géminis, you fall in the 1st decan (0°–10° Géminis).
As a 1st decan Géminis, your sub-ruler is also Mercury — the same planet that rules Géminis overall. This double Mercury influence concentrates and amplifies the core Géminis traits, making you a particularly pure expression of this sign's energy.
Números, Colores y Símbolos de la Suerte
Números de la Suerte
3, 12, 21, 30
Color de la Suerte
Yellow
Día de la Suerte
Wednesday
Piedra de Nacimiento
Emerald
Flor de Nacimiento
Lily of the Valley
Cristal Curativo
Agate
Símbolo Sabiano
"A glass-bottomed boat reveals undersea wonders"
Numerología
3
Estación
Spring
Elemento
Air
Modalidad
Mutable
Historical Events on May 21
- • 1881: American Red Cross is established by Clara Barton
- • 1927: Charles Lindbergh completes the first nonstop solo transatlantic flight
- • 1932: Amelia Earhart becomes the first woman to fly solo across the Atlantic
- • 1998: Indonesian President Suharto resigns after 31 years in power
Preguntas Frecuentes
Is May 21 Taurus or Gemini?
May 21 falls on the Taurus-Gemini cusp. The Sun typically moves from Taurus into Gemini around this date each year, so your exact sign depends on the year and time of birth. Swiss Ephemeris calculations show the Sun enters Gemini at varying times. Based on the standard date, your Sun sign is Géminis, but you'll likely feel both signs' influence.
What are the personality traits of someone born on May 21?
People born on May 21 are Géminis natives with Air element energy and Mutable modality. The 1st decan sub-ruled by Mercury adds a distinctive layer to the core Géminis personality, making these individuals unique among their sign.
Who is May 21 most compatible with?
May 21 Géminis natives are most compatible with signs that share the Air element (trine aspect) or complementary elements. Check the compatibility section above for specific sign matches and the best romantic dates.
What is the birthstone for May 21?
The traditional birthstone for people born on May 21 is Emerald. The decan-specific healing crystal is Agate, which resonates with the Mercury-influenced energy of the 1st decan of Géminis.
What decan is May 21?
May 21 falls in the 1st decan of Géminis (approximately 1° Géminis). This decan is sub-ruled by Mercury, which adds concentrated energy to the core Géminis traits.
What famous people were born on May 21?
While our celebrity database is still growing, all people born on May 21 share the Géminis Sun sign at approximately 1° with Mercury decan influence.
What is the lucky number for someone born on May 21?
The numerology root for May 21 is 3. Lucky numbers include 3, 12, 21, 30. The lucky day is Wednesday (ruled by Mercury), and the lucky color is Yellow.
What element is May 21?
May 21 belongs to the Air element through Géminis. Air signs are known for intuition, emotional depth, and empathy.
More 1st Decan Géminis Birthdays
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