Numerology · Western astrology · Chinese zodiac
May 21 Birthday: Zodiac Sign, Personality and Numerology
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In Western astrology, May 21 is a cusp birthday: depending on the year, time and place of birth, the Sun is in Taurus or Gemini. In numerology the day gives birthday number 3, while the Life Path also depends on the birth year. Many people born on cusp dates recognise something of both signs.
Key facts
| Sun sign | Taurus or Gemini: a cusp date, so the birth year, time and place decide |
|---|---|
| Decan | Taurus decan 3 (Saturn) or Gemini decan 1 (Mercury) |
| Sun's position at noon UTC | About 0° Gemini |
| Gemini · element · modality · ruler | Air · Mutable · Mercury |
| Birthday number | 21 → 3 |
| Life Path by birth year | 1960: 6 · 1970: 7 · 1980: 8 · 1990: 9 · 2000: 1 · 2010: 11 · 2020: 3 |
| Chinese zodiac | After Lunar New Year, so the animal is the birth year's own |
| Born on this day | Andrei Sakharov (1921), Sergei Shoigu (1955), Mary Robinson (1944) |
The May 21 birthday in astrology
Gemini season usually opens on the 21st of May, with the Sun at the first degree of the Twins, though some years and birth times keep it in late Taurus. Check the chart to know for sure. Either way, birthday number 3 favours communication, and the cusp mix pairs a talker's spark with an earthy sense of what is worth saying aloud.
Astronomically, May 21 puts the Sun near 0° Gemini in most years, inside the first ten-degree slice of the sign, which tradition links with Mercury. The cusp of Taurus and Gemini, around May 20 and 21, is where a fixed earth sign hands over to a mutable air sign. The changeover happens at a particular minute, and that minute varies with the year, so your actual Sun sign depends on when and where you were born. Checking a calculated chart removes the guesswork. Those who feel both energies often describe a grounded mind that also loves variety: someone who enjoys conversation and new ideas but wants them to lead somewhere tangible, preferably with a good meal along the way.
Birthday number and Life Path for May 21
Born on the 21st, your compound reduces as 2 + 1 = 3. Unlike the 12th, where the individual comes first, here the 2 of partnership leads and the 1 follows, which numerologists sometimes read as creativity that grows out of relationships. The resulting 3 is expressive, social and optimistic. Twenty-first-born people are often described as charming and versatile, able to bring people together and make collaborative projects enjoyable. As a supporting number, the 21 tends to show in how easily they connect. Seeing a shared project through to the end can be their most valued contribution.
Add the birth year and the picture shifts again: a May 21 birthday gives Life Path 9 for 1990, 1 for 2000, 11 for 2010 and 3 for 2020. Some birth years on this date reach the master number 11. Read the birthday number as a secondary note beside that main theme.
Season, Chinese zodiac and famous May 21 birthdays
May brings late spring in the northern hemisphere, a season of blossom and long evenings, and late autumn to the southern. Taurus holds the first three weeks, with Gemini arriving around May 20 or 21. In numerology May is month 5, the number of freedom, curiosity and change, which tends to give these birthdays a restless, experimental streak beneath the calm Taurean surface. May 21 is the 141st day of the year (142nd in a leap year). Counting forward, the next sign change, into Cancer, is usually complete within 32 days, by June 22.
By May 21 the Chinese new year is well under way, which means the animal and element are those of the calendar birth year. Among the best-known people with a May 21 birthday are Andrei Sakharov (1921), Sergei Shoigu (1955) and Mary Robinson (1944).
Read together
One tradition on its own gives a single angle. A Unified Reading puts your Life Path and name numbers, your Sun sign (plus Moon and rising when you know your birth time), your Chinese zodiac animal and your life stage side by side, and points out where they agree and where they pull apart. See how that looks in the fictional sample reading, or start with the free preview and pay $4.99 once only if you want the full reading.
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Frequently asked questions
What zodiac sign is May 21?
May 21 is a cusp date. Between 1930 and 2030 the Sun is in Taurus or Gemini on this date depending on the year, the time of birth and the time zone, and in most years at noon UTC it is in Gemini. The zodiac sign calculator settles it for a specific birth date.
What is the Life Path number for someone born on May 21?
It depends on the birth year. On May 21 the Life Path is 6 in 1960, 7 in 1970, 8 in 1980, 9 in 1990, 1 in 2000, 11 in 2010 and 3 in 2020. The birthday number, from the day alone, is 3 for everyone born on the 21st.
What Chinese zodiac sign is someone born on May 21?
For the Chinese zodiac, Lunar New Year has always passed by May 21, so the animal is simply the one for the birth year.
Which famous people were born on May 21?
Well-known people born on May 21 include Andrei Sakharov (1921), Sergei Shoigu (1955) and Mary Robinson (1944). The list comes from Wikidata and favours people with the most Wikipedia articles.
Last updated October 23, 2026. Awaiting editorial review. Numerology and astrology are interpretive traditions for reflection, not predictions.