If you were born on July 21, your zodiac sign is Cancer. The Sun occupies approximately 30° Cancer on this date, placing you in the 3rd decan ruled by Neptune.
Cusp Analysis
Born on July 21, you sit at the edge of the Cancer-Leo cusp (The Cusp of Oscillation). While your Sun is technically in Cancer, the influence of the neighboring sign is already prominent. The cusp spans July 21–25.
Learn more about The Cusp of Oscillation →Best Compatibility for July 21
♋ & ♉
Cancer & Taurus
View compatibility →
♋ & ♏
Cancer & Scorpio
View compatibility →
♋ & ♓
Cancer & Pisces
View compatibility →
Taurus provides the rock-solid stability Cancer craves, while sharing domestic values. Scorpio meets Cancer's emotional intensity with equal depth and fierce loyalty. Pisces creates a dreamy, intuitive bond where both feel truly seen.
Your Decan: 3rd Decan of Cancer
Each zodiac sign spans 30° of the ecliptic, divided into three decans of 10° each. Born on July 21 at approximately 30° Cancer, you fall in the 3rd decan (20°–30° Cancer).
While Cancer is ruled by Moon, your 3rd decan is sub-ruled by Neptune. This adds a distinctive layer: Neptune's influence blends with Moon's core energy, giving you qualities that set you apart from other Cancer natives in different decans.
Lucky Numbers, Colors & Symbols
Lucky Numbers
3, 12, 21, 30
Lucky Color
Indigo
Lucky Day
Monday
Birthstone
Ruby
Birth Flower
Larkspur
Healing Crystal
Labradorite
Sabian Symbol
"A daughter of the American Revolution"
Numerology
3
Season
Summer
Element
Water
Modality
Cardinal
Famous People Born on July 21
Historical Events on July 21
- • 356 BC: Temple of Artemis at Ephesus, one of the Seven Wonders, is destroyed by arson
- • 1865: Wild Bill Hickok kills Davis Tutt in the first recorded quick-draw duel
- • 1969: Neil Armstrong takes humanity's first steps on the Moon
- • 2011: Final Space Shuttle mission (Atlantis, STS-135) lands at Kennedy Space Center
Frequently Asked Questions
Is July 21 Cancer or Leo?
July 21 falls on the Cancer-Leo cusp. The Sun typically moves from Cancer into Leo around this date each year, so your exact sign depends on the year and time of birth. Swiss Ephemeris calculations show the Sun enters Leo at varying times. Based on the standard date, your Sun sign is Cancer, but you'll likely feel both signs' influence.
What are the personality traits of someone born on July 21?
People born on July 21 are Cancer natives with Water element energy and Cardinal modality. The 3rd decan sub-ruled by Neptune adds a distinctive layer to the core Cancer personality, making these individuals unique among their sign.
Who is July 21 most compatible with?
July 21 Cancer natives are most compatible with signs that share the Water 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 July 21?
The traditional birthstone for people born on July 21 is Ruby. The decan-specific healing crystal is Labradorite, which resonates with the Neptune-influenced energy of the 3rd decan of Cancer.
What decan is July 21?
July 21 falls in the 3rd decan of Cancer (approximately 30° Cancer). This decan is sub-ruled by Neptune, which adds complementary energy to the core Cancer traits.
What famous people were born on July 21?
Famous people born on July 21 include Robin Williams. All share the Cancer Sun sign, though their individual charts create unique expressions of this energy.
What is the lucky number for someone born on July 21?
The numerology root for July 21 is 3. Lucky numbers include 3, 12, 21, 30. The lucky day is Monday (ruled by Moon), and the lucky color is Indigo.
What element is July 21?
July 21 belongs to the Water element through Cancer. Water signs are known for intuition, emotional depth, and empathy.
More 3rd Decan Cancer Birthdays
Explore
Discover your complete birth chart
Your Sun sign is just the beginning. Get your full natal chart with Moon, Rising, and all planetary placements.
Get Your Free Chart– it's free