If you were born on October 21, your zodiac sign is Libra. The Sun occupies approximately 29° Libra on this date, placing you in the 3rd decan ruled by Mercury.
Cusp Analysis
Born on October 21, you sit at the edge of the Libra-Scorpio cusp (The Cusp of Drama). While your Sun is technically in Libra, the influence of the neighboring sign is already prominent. The cusp spans October 21–25.
Learn more about The Cusp of Drama →Best Compatibility for October 21
♎ & ♊
Libra & Gemini
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♎ & ♌
Libra & Leo
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♎ & ♐
Libra & Sagittarius
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Gemini provides the mental stimulation and social energy Libra thrives on. Leo's warmth and romantic grandeur makes Libra feel adored and inspired. Sagittarius brings optimistic adventure that expands Libra's worldview and prevents stagnation.
Your Decan: 3rd Decan of Libra
Each zodiac sign spans 30° of the ecliptic, divided into three decans of 10° each. Born on October 21 at approximately 29° Libra, you fall in the 3rd decan (20°–30° Libra).
While Libra is ruled by Venus, your 3rd decan is sub-ruled by Mercury. This adds a distinctive layer: Mercury's influence blends with Venus's core energy, giving you qualities that set you apart from other Libra natives in different decans.
Lucky Numbers, Colors & Symbols
Lucky Numbers
3, 12, 21, 30
Lucky Color
Silver
Lucky Day
Friday
Birthstone
Opal
Birth Flower
Marigold
Healing Crystal
Tourmaline
Sabian Symbol
"Mankind's vast and enduring effort to reach for knowledge transferable from generation to generation"
Numerology
3
Season
Autumn
Element
Air
Modality
Cardinal
Famous People Born on October 21
Historical Events on October 21
- • 1805: Battle of Trafalgar: British Navy defeats France and Spain; Admiral Nelson is killed
- • 1879: Thomas Edison successfully tests an incandescent light bulb
- • 1959: Solomon R. Guggenheim Museum opens in New York City
- • 2015: Marty McFly's arrival date in Back to the Future Part II
Frequently Asked Questions
Is October 21 Libra or Scorpio?
October 21 falls on the Libra-Scorpio cusp. The Sun typically moves from Libra into Scorpio around this date each year, so your exact sign depends on the year and time of birth. Swiss Ephemeris calculations show the Sun enters Scorpio at varying times. Based on the standard date, your Sun sign is Libra, but you'll likely feel both signs' influence.
What are the personality traits of someone born on October 21?
People born on October 21 are Libra natives with Air element energy and Cardinal modality. The 3rd decan sub-ruled by Mercury adds a distinctive layer to the core Libra personality, making these individuals unique among their sign.
Who is October 21 most compatible with?
October 21 Libra 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 October 21?
The traditional birthstone for people born on October 21 is Opal. The decan-specific healing crystal is Tourmaline, which resonates with the Mercury-influenced energy of the 3rd decan of Libra.
What decan is October 21?
October 21 falls in the 3rd decan of Libra (approximately 29° Libra). This decan is sub-ruled by Mercury, which adds complementary energy to the core Libra traits.
What famous people were born on October 21?
Famous people born on October 21 include Kim Kardashian. All share the Libra Sun sign, though their individual charts create unique expressions of this energy.
What is the lucky number for someone born on October 21?
The numerology root for October 21 is 3. Lucky numbers include 3, 12, 21, 30. The lucky day is Friday (ruled by Venus), and the lucky color is Silver.
What element is October 21?
October 21 belongs to the Air element through Libra. Air signs are known for intuition, emotional depth, and empathy.
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