Charts & data › Rising sign calculator

Free Rising Sign Calculator

Calculate the Ascendant, or sign rising on the eastern horizon, from a recorded local birth time and birthplace coordinates.

STAR & SIGIL

See the sky at your birth

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What is the rising sign?

The Ascendant is the point where the ecliptic meets the eastern horizon at the selected time and place. Its zodiac section is called the rising sign. Earth’s rotation changes that point continually, so the birth date alone cannot determine it.

Check the recorded time

The result includes the calculated Ascendant 15 minutes before and after the entered time using the same location and UTC offset. These comparisons show how sensitive this particular chart is. The sign may stay the same even though its degree changes. A historical daylight saving or time-zone error can shift the result.

Read about the Ascendant → · Calculate the full birth chart →

Method: horizon/ecliptic intersection and apparent geocentric tropical positions from Astronomy Engine 2.1.19 via this site’s independent chart engine. This calculator uses the offset you enter and does not have a historical time-zone database.

Reading the result

The inputs that matter

Enter the local date and clock time as recorded, the offset from UTC that applied then, and the birthplace latitude and longitude. The browser converts the time to one UTC instant and calculates the ecliptic’s intersection with the local eastern horizon. It also reports the Midheaven as a reference angle. A modern UTC offset can be wrong for an older birth or a daylight-saving date.

Check time sensitivity

The result recalculates the Ascendant fifteen minutes before and after your entered time at the same coordinates. Sometimes all three samples share a sign while their degrees differ; near a sign boundary, one of the nearby samples may show another sign. This comparison illustrates sensitivity for that record, but does not estimate or repair an unknown birth time.

Limits near the poles

The local horizon geometry can become undefined close to the geographic poles. The calculator reports that condition rather than inventing an Ascendant. A correct location and historical offset are important anywhere, especially for people comparing results from different websites. Use the full birth chart to see the rising sign beside planets and houses.

The Ascendant is a horizon angle, so it responds to longitude, latitude, and local sidereal time. Two people born at the same UTC instant in different places can have different rising signs, even while their geocentric planetary zodiac positions agree. If your certificate records only an approximate hour, compare the nearby-time results and avoid treating a boundary placement as certain.

Open the expanded Free Rising Sign Calculator view →