Your Sun sign is the starting point of astrology — but for the roughly 20 million people born on a cusp date each year, it's not always obvious. The Sun changes signs on a different calendar date each year, and a few days' difference in your birthday can place you firmly in one sign or the other. This calculator uses astronomical precision to tell you exactly which sign the Sun was in when you were born.
What Is a Sun Sign?
Your Sun sign is the zodiac sign the Sun occupied on the day you were born. In Western astrology, the Sun represents your conscious identity — the self you are actively building and expressing throughout your lifetime. Many people find they grow into their Sun sign more completely by their 30s and 40s.
The Sun sign is just one of three foundational placements. Your complete picture also includes your Moon sign (emotional nature) and Rising sign (outer self). For a full reading of all three, use the Birth Chart Calculator.
The 12 Sun Signs — Core Qualities
Aries (March 21 – April 19)
The pioneer of the zodiac. Aries Sun people lead with instinct, courage, and a drive to initiate. At their best: bold, direct, and inspiring. At their most challenging: impatient and prone to burning out before the finish line. Your Mars sign shows how this pioneering energy operates in practice.
Taurus (April 20 – May 20)
The builder of the zodiac. Taurus Sun people are defined by their relationship to the physical world — beauty, comfort, stability. They are sensual, patient, and extraordinarily persistent. Your Venus sign deepens the picture of how Taurus energy expresses in love and pleasure.
Gemini (May 21 – June 20)
The communicator. Gemini Sun people are driven by curiosity, connection, and the need to articulate. They are quick-minded, adaptable, and socially alive. Your Mercury sign reveals how this communicative energy operates in your specific mind.
Cancer (June 21 – July 22)
The nurturer. Cancer Sun people are deeply oriented toward home, family, and emotional security. They feel everything intensely and remember everything vividly. Your Moon sign is particularly important for Cancer Suns — the Moon is Cancer's ruling planet.
Leo (July 23 – August 22)
The creator. Leo Sun people are animated by self-expression and the desire to shine. They are naturally warm, generous, and magnetic. Check your Rising sign — Leo Rising and Leo Sun together create an especially powerful solar presence.
Virgo (August 23 – September 22)
The analyst. Virgo Sun people are driven by the desire to understand, improve, and be of service. They are precise, observant, and quietly devoted. Mercury rules Virgo, so your Mercury sign reveals much about how your Virgo nature operates.
Libra (September 23 – October 22)
The diplomat. Libra Sun people are oriented toward beauty, balance, and their relationships above all else. Venus rules Libra — your Venus sign adds important texture to how you express Libran energy in relationships.
Scorpio (October 23 – November 21)
The transformer. Scorpio Sun people are driven by depth, intensity, and the compulsion to understand what lies beneath the surface. Mars is Scorpio's classical ruler — your Mars sign shapes how this transformative intensity plays out.
Sagittarius (November 22 – December 21)
The seeker. Sagittarius Sun people are animated by philosophy, adventure, and the endless pursuit of meaning. Jupiter rules Sagittarius — your Jupiter sign shapes how this expansive energy operates in your life.
Capricorn (December 22 – January 19)
The achiever. Capricorn Sun people are defined by ambition, discipline, and the long view. They build slowly but they build to last. Saturn rules Capricorn — your Saturn sign is especially significant if you're a Capricorn Sun. Also check if you're in your Saturn Return.
Aquarius (January 20 – February 18)
The visionary. Aquarius Sun people are oriented toward ideas, humanity, and the future. They are independent, original, and invested in collective wellbeing. Your Saturn and Rising sign together with your Aquarius Sun create your full public profile.
Pisces (February 19 – March 20)
The mystic. Pisces Sun people are the most fluid and boundless of all the signs — empathic, imaginative, and spiritually porous. Jupiter is Pisces' traditional ruler — your Jupiter sign shapes how this spiritual and expansive energy manifests.
Sun Sign vs. Rising Sign vs. Moon Sign — Why All Three Matter
If you've ever thought "I'm nothing like my Sun sign," there's a very good reason. Your Sun sign is only one of three fundamental placements. Your Rising sign is what people see first — it governs your physical appearance and default manner. Your Moon sign governs your emotional life — how you react instinctively, what you need to feel secure. Read the deeper explanation in our guide: Your Big 3 Are Just the Start.
Your Sun Sign in Vedic Astrology — Why It May Be Different
If you've explored Vedic astrology, you may have noticed that your Sun sign is different — usually one sign earlier. This shift exists because Western and Vedic astrology use different zodiac systems. For a full explanation, read: Western vs Vedic Astrology: What's the Difference and Which Is More Accurate? and Why Your Western Sun Sign Feels Wrong (Your Vedic Chart Explains Why).
Cusp Dates — Why Your Sun Sign Might Not Be What You Think
The Sun doesn't change signs on the same date every year. If you were born between approximately the 18th and 23rd of any month, you may have always been told you're "on the cusp" — but astrologically speaking, cusps don't exist. The Sun is always in one sign at any given moment. This calculator uses Swiss Ephemeris data to give you a definitive answer.
Once you know your Sun sign, explore the rest of your chart with the Birth Chart Calculator, find your emotional nature with the Moon Sign Calculator, and discover your outer self with the Rising Sign Calculator.
→ Find your exact Sun sign now — no more cusp confusion