Birth Chart Calculator
Discover the cosmic blueprint of your soul. Your birth chart reveals the positions of the planets at the exact moment you were born.
About Birth Chart Calculations
What is a Birth Chart?
A birth chart (natal chart) is a snapshot of the sky at the exact moment and location of your birth. It maps the positions of the Sun, Moon, planets, and astrological houses, revealing your personality, strengths, challenges, and life path.
How Accurate Are These Calculations?
Our calculator uses Moshier's Ephemeris, a professional-grade astronomical calculation engine based on Jean Meeus's "Astronomical Algorithms." This provides planetary positions accurate to within 1-2 arc-minutes — the same quality used by professional astrologers worldwide.
- Placidus House System: One of the most widely used house systems in Western astrology
- Tropical Zodiac: Based on the seasons, starting at the Spring Equinox
- Automatic Timezone Detection: Accounts for historical daylight saving time changes
Tips for Most Accurate Results
- Use your birth certificate time: Even 4 minutes can change your Rising sign
- Enter exact birth location: Use the geocoding search for precise coordinates
- Double-check timezone: The calculator auto-detects, but verify for historical births
- Unknown birth time? Use 12:00 PM for Sun sign insights (houses won't be accurate)
Understanding Your Results
Your "Big Three" (Sun, Moon, Rising) form the foundation of your personality. The Sun represents your core identity, the Moon your emotional nature, and your Rising sign (Ascendant) how others perceive you. Planetary positions in houses show which life areas each planet's energy manifests most strongly.
When were you born?
Frequently Asked Questions
What is a birth chart?
A birth chart (natal chart) is a map of where all the planets were at the exact moment and location of your birth. It reveals your Sun sign, Moon sign, Rising sign, and planetary positions across 12 astrological houses.
How do I read my birth chart?
Start with your Big Three: Sun sign (core identity), Moon sign (emotions), and Rising sign (how others see you). Then explore which houses your planets fall in — each house represents a different life area.
What are the big three in astrology?
The Big Three are your Sun sign, Moon sign, and Rising sign (Ascendant). Together they form the foundation of your astrological profile — core self, emotional nature, and outward persona.
Why do I need my birth time and location?
Your birth time determines your Rising sign and house positions, which change every few minutes. Your birth location affects the exact degree of each planet. Without these, your chart will be less precise.