Big Three Calculator

Find your Sun, Moon and Rising sign. Free, private and calculated right in your browser.

Birth date

Birth time

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Birth city

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Latitude (north +)

Longitude (east +)

Time zone

Reveal my Big Three

What are the Big Three?

In astrology, your Sun sign is who you are at your core, your Moon sign is your emotional nature, and your Rising sign (or Ascendant) is the first impression you make. Together they give a much fuller picture than Sun sign horoscopes alone.

Why birth time and place matter

Your Sun changes signs about once a month, so your date alone is enough for it. Your Moon changes signs every two to three days, so on a day when it switches the time of birth matters. Your Rising sign changes roughly every two hours and depends on your birth location, so you need both an accurate time and a place for it. If you do not know your birth time, a birth certificate or the hospital records are the best sources.

How it is calculated

The calculator uses the tropical zodiac and standard astronomical formulas. Time zones are looked up for the specific date, so historical daylight saving rules are applied. See About & method for details. Your birth details never leave your device.