What zodiac sign is May 21?

If you were born on May 21, your Sun sign is Gemini. The Sun typically moves from steady, earthy Taurus into quick, airy Gemini around May 20 or 21 each year, depending on the exact time and location of birth. For most people born on this date, the Sun has already crossed the threshold, making them Geminis. To be absolutely certain, you would need to cast a natal chart using your precise birth time and place — if the Sun is at 0 degrees Gemini or beyond, you are a Gemini; if it is still at 29 degrees Taurus, you are a Taurus.

Gemini is a mutable air sign ruled by Mercury, the planet of communication, intellect, and connection. Those born under this sign tend to be curious, adaptable, and quick-witted, with a natural gift for words and ideas. Because May 21 is the very first degree of Gemini, people born on this date often carry a blend of Taurus stability and Gemini restlessness — a love of comfort paired with a constant itch for new information and experiences.

Astrology is a symbolic language and a tool for self-reflection, not a scientific system. A birth chart can offer insight, but it does not define your fate or personality in absolute terms. If you are curious about how this cusp energy plays out in your own life, you can explore your full natal chart — including your Moon, rising sign, and planetary placements — through the Destiny Matrix system on our site.