☉ Sun sign — who you are
Your core identity, ego and life purpose. It describes what energises you and the qualities you are growing into over your lifetime.
Big Three Calculator – Find Your Sun, Moon & Rising Signs
Your sun sign is only one part of the story. Enter your birth date, time and city to calculate your Sun, Moon and Rising signs — the three placements astrologers look at first.
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How to Use the Big Three Calculator
- Enter your date of birth. This sets the Sun’s position and narrows down the Moon.
- Add your birth time. Check your birth certificate or ask a parent. Even an approximate time is better than none; if you don’t know it, tick the box and we’ll calculate your Sun and Moon only.
- Choose your birth city. Pick the nearest city, or enter exact coordinates. The calculator converts your local time to Universal Time using the correct historical time-zone rules.
- Press “Calculate”. You’ll see all three signs with their exact degrees, a short interpretation of each and the full calculation details.
How Your Sun, Moon and Rising Signs Are Calculated
The calculator first converts your local birth time to Universal Time and then to a Julian Day, the continuous day count astronomers use. From there:
- Sun sign: the Sun’s ecliptic longitude is found with the standard low-precision solar formula, which is accurate to about one arc-minute. Each 30° of longitude is one sign, starting with Aries at 0°.
- Moon sign: the Moon’s longitude is calculated from its mean orbit plus the forty largest periodic corrections published by astronomer Jean Meeus, giving accuracy of a few arc-minutes.
- Rising sign: your city’s longitude turns Greenwich sidereal time into local sidereal time. Combined with your latitude and the tilt of Earth’s axis, this gives the point of the zodiac rising on the eastern horizon — your Ascendant.
Because the Moon moves about 13° a day and the Ascendant sweeps through every sign in 24 hours, these two placements depend heavily on your birth time. When one of them sits near the edge of a sign, the result card tells you so.
What Your Big Three Mean
☽ Moon sign — how you feel
Your emotional needs, instincts and what makes you feel safe. People close to you often know your Moon sign side best.
↑ Rising sign — how you appear
Your outer style, first impression and approach to new situations. It also sets up the houses of your birth chart.
Think of your Big Three as a team. A Leo Sun with a Cancer Moon and Virgo Rising, for example, may have a big creative heart (Leo), a deep need for home and family (Cancer) and a modest, organised first impression (Virgo). That mix explains why two people with the same sun sign can seem so different.
Once you know your three signs, read the daily horoscope for both your Sun and Rising signs, or compare your Moon sign with a partner’s using the love compatibility calculator.
Frequently Asked Questions
The Big Three are your Sun sign, Moon sign and Rising sign. Together they give a fuller picture than your sun sign alone: the Sun shows your core identity, the Moon your emotional nature and the Rising sign how you come across to others.
The Moon changes sign roughly every two and a half days, and the Rising sign changes about every two hours. Without an accurate birth time the Rising sign cannot be calculated and the Moon sign may be uncertain.
It uses standard astronomical approximations that place the Sun and Moon within a few arc-minutes of their true positions, and it applies the correct historical time zone and daylight saving rules for the listed cities. Results are approximate; if a placement is close to a sign boundary we warn you.
Choose the nearest city in the same time zone, or select “Other location” and enter your latitude, longitude and the UTC offset that applied at your birth (for example 5.5 for India or −5 for New York in winter).
Yes. “Rising sign” and “Ascendant” mean the same thing: the zodiac sign that was rising over the eastern horizon at the moment and place of your birth.
No. This calculator uses the Western tropical zodiac. The Vedic (sidereal) Moon sign is usually one sign earlier. Use the Moon sign (rashi) calculator for the Vedic version.