Rising sign calculator

Enter your birth date, time and place. The calculation accounts for the time zone and daylight saving rules in effect that day.

What is a rising sign?

Your rising sign, or Ascendant, is the zodiac sign that was rising on the eastern horizon at the exact moment you were born. It marks the 1st house of your birth chart, which describes how you come across, how others see you and how you start anything new. If the Sun is who you are, the Ascendant is how that self steps out into the world.

Why you need your exact birth time

Earth turns once every 24 hours, so the horizon sweeps through all 12 signs in a day: the Ascendant changes sign roughly every two hours, and sometimes in under an hour at high latitudes. A 10 or 15 minute difference can change the result if you were born near a sign change. The time on your birth certificate is the most reliable reference.

How it's calculated

The calculator converts your local time to Coordinated Universal Time using your browser's time zone database, which includes each country's daylight saving changes year by year. From that moment it works out local sidereal time, the angle that shows which part of the sky was crossing your meridian, and combines it with your city's latitude and the tilt of the ecliptic to get the exact degree of your Ascendant. Results have been checked against Swiss Ephemeris, the standard behind professional astrology software, across hundreds of cases, with differences under a tenth of a degree. City coordinates come from GeoNames (CC BY 4.0 licence).

Rising sign and horoscopes

Sun-sign horoscopes are written for your Sun sign, but many astrologers suggest also reading the one for your rising sign, because it maps the houses of your chart more closely. That's why you get both links with your result. Read the weekly horoscope and the monthly horoscope for both signs.

Quick answers

How do I find my rising sign?

You need your birth date, time and place. With those three details the calculator finds the sign that was rising on the eastern horizon at that moment, which is your rising sign.

Can I find my rising sign without my birth time?

Not reliably. The Ascendant changes sign roughly every two hours, so without the time there are several possibilities. If you only know the rough window (morning, evening), you can calculate both ends and see whether they match.

Is the rising sign more important than the Sun sign?

It isn't more important, just different. Your Sun sign describes your identity and will; your rising sign describes how you present yourself and start things. In a birth chart they're read together, along with the Moon.

Is my birth data stored?

No. The calculation runs on your device, and nothing is sent to a server or saved.