What the Big Three are
Your Sun, Moon and Rising signs are the three placements most astrologers read first. The Sun sign describes your core direction, the Moon sign your emotional needs, and the Rising sign (Ascendant) the way you meet the world.
Together they give a fuller picture than your Sun sign alone — two people with the same Sun sign can have very different Moon and Rising signs.
Why the birth time matters
The Rising sign changes roughly every two hours and the Moon changes sign about every two and a quarter days. An accurate birth time, ideally from a birth certificate, gives the most reliable result.
If your time is approximate, choose “Approximate” to see which signs are possible within an hour either side. If you do not know it at all, choose “I don’t know”: we show your Sun and Moon for the whole birth date and do not guess a Rising sign.
How we calculate
Positions are tropical and geocentric, calculated in your browser with the open-source Astronomy Engine library and checked against Swiss Ephemeris reference values. Your birthplace sets the coordinates and the historical time zone, including daylight-saving changes.
Your date and time never leave your device. Only the city name you search for is sent to find matching places. Saving your details is optional and stays in this browser.
Reading the results
Astrology offers themes for reflection, not predictions or facts about who you must be. Use your placements as a starting point for curiosity, never as a reason to make health, money or other important decisions.
Can I find my Big Three without a birth time?
Partly. On about half of all dates your Sun and Moon signs can both be found from the date and birthplace alone; on the day one of them changes sign, we show both possible signs. Choose “I don’t know” and we check the whole birth date in your birthplace’s time zone.
Your Rising sign cannot be found without a birth time, so we say so instead of guessing. If you know roughly when you were born, choose “Approximate” to see every Rising sign that is possible within an hour either side.
I was born on a cusp day — which Sun sign am I?
Zodiac date ranges are averages. The Sun enters each sign at a slightly different moment every year, so for birthdays at the start or end of a range the only reliable answer is the Sun’s actual position at your birth — which is what this calculator uses.
Why is my result different on another website?
The most common reasons are a different zodiac (Vedic astrology uses the sidereal zodiac, which is currently about 24° behind the tropical zodiac used here), a wrong time zone or daylight saving offset for the birthplace, or a birth time that is not quite right. We use the tropical zodiac and the historical time zone rules of your birthplace.