Ascendants Calculator
Ascendants calculator works out Rising sign and Exact ascendant from Date of birth, Time of birth (local) and UTC offset of the birthplace at birth. The default figures on this page give rising sign of Virgo; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Birth moment in UT gives Julian Day 2448058 (JDE 2448058.00066 after Delta T).
- Local apparent sidereal time drives the right ascension of the midheaven.
- Ascendant = atan2(cos RAMC, -(sin RAMC cos e + tan lat sin e)) = 175.4221 degrees.
- That is 25 Virgo 25'19"; the midheaven is 24 Gemini 02'35".
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the ascendants calculator calculates
Computes the ascendant - the zodiac degree rising on the eastern horizon - from birth date, exact time and geographic coordinates.
How to use this ascendants calculator
Enter Date of birth, Time of birth (local), UTC offset of the birthplace at birth and Birth latitude. Rising sign updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Rising sign, Exact ascendant and Degrees into the sign.
The method follows Jean Meeus, Astronomical Algorithms and US Naval Observatory, Explanatory Supplement to the Astronomical Almanac.
Greenwich at J2000 noon UT example
With Date of birth: 2000-01-01, Time of birth (local): 12:00, UTC offset of the birthplace at birth: 0, Birth latitude: 51.4769, the calculator returns Ascendant longitude: 24.265. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Rising sign, Exact ascendant and Degrees into the sign. The inputs you can vary are Date of birth, Time of birth (local), UTC offset of the birthplace at birth, Birth latitude and Birth longitude.
Understanding Rising sign, Exact ascendant and Degrees into the sign
For entertainment and cultural interest. Astrology and numerology are traditional practices with no scientific basis for predicting events or describing a person; do not use them for health, financial or legal decisions.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What information do I need for the ascendants calculator?
You need Date of birth, Time of birth (local), UTC offset of the birthplace at birth, Birth latitude and Birth longitude. The page opens with default figures that give rising sign of Virgo, so you can see the scale before entering your own.
What does this ascendants calculator show?
It shows Rising sign, Exact ascendant, Degrees into the sign, Ascendant longitude, Element, Modality, Chart ruler and Midheaven (MC), with the working and any warnings for your entries.
Can I check how the ascendants calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.