Astro Chart Calculator
Astro chart calculator works out Sun sign and Moon sign from Date of birth, Time of birth (local) and UTC offset of the birthplace at birth. The default figures on this page give sun, Moon and rising of Gemini Sun, Pisces Moon, Virgo rising; 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 converted to Julian Day 2448058 UT.
- Sun at 84.132 deg, Moon at 345.358 deg (tropical ecliptic longitude).
- Tropical zodiac: longitudes are measured from the vernal equinox.
- Signs are 30-degree divisions starting at 0 Aries.
Positionstable
| body | sign | position | longitude | element |
|---|---|---|---|---|
| Sun | Gemini | 24 Gemini 07'56" | 84.13219 | Air |
| Moon | Pisces | 15 Pisces 21'29" | 345.358032 | Water |
| Ascendant | Virgo | 25 Virgo 25'19" | 175.422076 | Earth |
| Midheaven | Gemini | 24 Gemini 02'35" | 84.043039 | Air |
Its 3 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the astro chart calculator calculates
Computes the Sun, Moon, ascendant and midheaven positions of a birth chart from a real ephemeris, in tropical or sidereal zodiac.
How to use this astro chart calculator
Enter Date of birth, Time of birth (local), UTC offset of the birthplace at birth and Birth latitude. Sun 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 Sun sign, Moon sign and Rising sign.
The method follows Jean Meeus, Astronomical Algorithms, US Naval Observatory, Explanatory Supplement to the Astronomical Almanac and Indian Ephemeris and Nautical Almanac / Rashtriya Panchang, Lahiri (Chitrapaksha) ayanamsa.
Sun at the 1992 October equinox-adjacent date example
With Date of birth: 1992-10-13, Time of birth (local): 00:00, UTC offset of the birthplace at birth: 0, Birth latitude: 51.4769, the calculator returns Sun sign: Libra. 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 Sun sign, Moon sign and Rising sign. The inputs you can vary are Date of birth, Time of birth (local), UTC offset of the birthplace at birth, Birth latitude, Birth longitude and Zodiac.
Understanding Sun sign, Moon sign and Rising 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 astro chart calculator?
You need Date of birth, Time of birth (local), UTC offset of the birthplace at birth, Birth latitude, Birth longitude and Zodiac. The page opens with default figures that give sun, Moon and rising of Gemini Sun, Pisces Moon, Virgo rising, so you can see the scale before entering your own.
What does this astro chart calculator show?
It shows Sun sign, Moon sign, Rising sign, Positions, Sun, Moon and rising, Zodiac, Ayanamsa applied and Element balance, with the working and any warnings for your entries.
Can I check how the astro chart 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.