Free Sun Sign Calculator
Find your sun sign in seconds — then go deeper than the label with your exact degree, decan, ruling planet, and house. Born on a cusp? We resolve it. No signup.
Your Sun Sign Is Just the Beginning
You already know your sign — here is what it doesn't tell you.
The Sun spends about a month in each sign
How far the Sun moves along the zodiac each day
Time the Sun takes to travel the whole zodiac
Almost everyone can name their sun sign — but that label is the cover of the book, not the book. Your Sun governs your core identity, ego, and life purpose, yet its exact degree, its decan, and the house it falls in all change how that energy actually expresses in your life. Knowing you are a Leo is the start; knowing you are a 2nd-decan Leo in the 10th house is the real story.
What Is a Sun Sign?
Your sun sign is the zodiac sign the Sun was passing through at the exact moment you were born. It represents your core identity, ego, and life purpose — the conscious you at the centre of your personality.
The Sun is the heart of your chart. Where the Moon rules your inner emotional world and your rising sign shapes the first impression you make, the Sun is who you are consciously becoming — your sense of self, your vitality, and the purpose you grow into over a lifetime.
Because the Sun spends about 30 days in each sign, your birth date alone is enough to find your sun sign on almost every day of the year. The only exception is a cusp day, when the Sun crossed from one sign into the next — then your exact birth time and year decide it.
How to Find Your Sun Sign in 3 Steps
It takes about ten seconds.
Enter your birth date
Your date of birth is almost always all that's needed — the Sun stays in one sign for about a month, so your date pins down your sun sign on most days instantly.
Add your birth place and time (optional)
Start typing your city and pick it from the list. Adding your exact birth time resolves cusp birthdays and unlocks your Sun's house — but on most days it's optional.
Reveal your sun sign and full readout
Instantly see your sun sign, its exact degree, decan and ruling planet, your Sun house, and a free reading of what it means for your identity.
Born on a Cusp? How to Know Your Real Sun Sign
If you were born on the day the Sun changed signs — usually around the 19th to 23rd of a month — your sun sign depends on your exact birth time and year. There is no 'both': you have one sun sign, and only the Sun's precise position decides it.
Pop astrology likes to call people 'a Leo-Virgo cusp,' but astrologically that isn't a thing. The Sun is in exactly one sign at the moment you were born. If your birthday falls on a sign boundary, the answer simply depends on the year and time you arrived.
When you were born on a cusp day and don't know your birth time, ChartNova shows you both candidate signs with a short reading of each, then lets you add your birth time to resolve it to the one true answer — instead of guessing from a fixed date table that's wrong on cusp days.
Fixed 'zodiac date' tables in magazines are wrong for some cusp birthdays, because sign boundaries shift by up to a day each year. An ephemeris-based calculator like this one is accurate to the exact moment.
Your Sun's Degree, Decan & House — Explained
The three details that turn 'I'm a Leo' into a precise placement.
Exact degree
Each sign spans 30 degrees, and your Sun sits at a precise one. Early degrees (0–5°) feel like a fresh start in the sign; the final degree (29°, the 'anaretic degree') carries a sense of urgency and mastery. Your degree is where your sun sign actually lives.
Decan & decan ruler
Every sign divides into three 10-degree decans, each with a sub-ruling planet that colours how the sign expresses. A 1st-decan Leo (ruled by the Sun) is pure Leo; a 2nd-decan Leo (ruled by Jupiter) is more expansive and generous; a 3rd-decan Leo (ruled by Mars) is bolder and more driven.
Sun house
When you know your birth time, your Sun falls in one of twelve houses — the life area it energizes. A 10th-house Sun pours its identity into career and public life; a 5th-house Sun shines through creativity and romance. This is why birth time adds so much depth.
The 12 Sun Signs: Dates & Meanings
A quick look at each sun sign and its date range.
Aries
Mar 21 – Apr 19
Bold, pioneering, and driven — a natural initiator who leads from the front.
Taurus
Apr 20 – May 20
Steady, sensual, and determined — building security and lasting comfort.
Gemini
May 21 – Jun 20
Curious, quick, and communicative — endlessly gathering ideas and connections.
Cancer
Jun 21 – Jul 22
Caring, intuitive, and protective — anchored by home and emotional bonds.
Leo
Jul 23 – Aug 22
Warm, expressive, and proud — born to create, perform, and be seen.
Virgo
Aug 23 – Sep 22
Precise, practical, and helpful — refining everything toward usefulness.
Libra
Sep 23 – Oct 22
Charming, fair, and relational — seeking balance, beauty, and harmony.
Scorpio
Oct 23 – Nov 21
Intense, magnetic, and deep — transforming through passion and truth.
Sagittarius
Nov 22 – Dec 21
Adventurous, optimistic, and free — chasing meaning and the bigger picture.
Capricorn
Dec 22 – Jan 19
Ambitious, disciplined, and resilient — building lasting achievement.
Aquarius
Jan 20 – Feb 18
Original, independent, and visionary — thinking ahead of the crowd.
Pisces
Feb 19 – Mar 20
Imaginative, compassionate, and dreamy — flowing between worlds with deep empathy.
Sun Sign vs Moon Sign vs Rising Sign
Together, these three placements are your astrological Big Three.
- Governs: Core identity, ego, life purpose
- The 'you' it describes: The conscious you
- Needs to calculate: Birth date only
- Governs: Emotions, instincts, inner world
- The 'you' it describes: The private you
- Needs to calculate: Date + place (time ideal)
- Governs: First impression, outward style
- The 'you' it describes: The you others meet first
- Needs to calculate: Exact birth time required
Think of your chart as a house: your rising sign is the front door everyone sees, your sun sign is the living room where you actually live, and your moon sign is the private bedroom no one but you really knows.
Free Sun Sign Calculator vs Paid Readings
Everything you need to know your Sun — at no cost.
| Feature | ChartNova | Typical sites |
|---|---|---|
| Exact sun degree, decan and ruler | ||
| Sun house (with birth time) | ||
| Premium sun wheel chart visual | ||
| Resolves cusp birthdays (shows both signs) | Rarely | |
| Free, instant, no signup | $4.95+ |
What to Do After You Find Your Sun Sign
Your sun sign is the doorway to your whole chart.
Ready to read your whole chart?
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