Birth Star Chart Calculator
Birth star chart calculator works out Sidereal longitude and Sign index (0 = Mesha/Aries) from Ayanamsha convention, Explicit ayanamsha value and Date of birth. The default figures on this page give moon rashi (Janma Rashi) of Kumbha; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
5 steps
- Birth moment converted to Julian Day 2448057.77083 UT (JDE 2448057.7715 after Delta T).
- Tropical longitudes from the Meeus series, then lambda_sidereal = normalize(lambda_tropical - 23.71977).
- Moon at 318.5856 degrees sidereal: Kumbha (Aquarius) 18.59 degrees.
- That falls in Shatabhisha pada 4, lorded by Rahu; 1.9094 years of the Rahu mahadasha remained at birth.
- Lagna at 145.7078 degrees sidereal: Simha.
Vimshottari sequencetable
| lord | years |
|---|---|
| Rahu | 1.909445 |
| Jupiter | 16 |
| Saturn | 19 |
| Mercury | 17 |
| Ketu | 7 |
| Venus | 20 |
| Sun | 6 |
| Moon | 10 |
| Mars | 7 |
Positionstable
| body | rashi | sign | degreeInSign | longitude |
|---|---|---|---|---|
| Sun | Mithuna | Gemini | 0.1935 | 60.1935 |
| Moon | Kumbha | Aquarius | 18.5856 | 318.5856 |
| Rahu (mean) | Makara | Capricorn | 15.9867 | 285.9867 |
| Ketu (mean) | Karka | Cancer | 15.9867 | 105.9867 |
| Lagna | Simha | Leo | 25.7078 | 145.7078 |
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the birth star chart calculator calculates
Computes sidereal (Vedic) longitudes, rashi, nakshatra with pada and the Vimshottari dasha balance from a birth date, time and place, with the ayanamsha named and its value shown.
How to use this birth star chart calculator
Enter Ayanamsha convention, Explicit ayanamsha value, Date of birth and Time of birth (local). Sidereal longitude updates as you type. 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 Sidereal longitude, Sign index (0 = Mesha/Aries) and Sign (western name).
The method follows Rashtriya Panchang / Indian Astronomical Ephemeris, Lahiri (Chitrapaksha) ayanamsa, Jean Meeus, Astronomical Algorithms, 2nd edition and Vimshottari dasha: the 120-year cycle of nine lords.
What you can compare
Change one input at a time to see how it affects Sidereal longitude, Sign index (0 = Mesha/Aries) and Sign (western name). The inputs you can vary are Ayanamsha convention, Explicit ayanamsha value, Date of birth, Time of birth (local), Birth time is known and UTC offset at the birthplace.
Understanding Sidereal longitude, Sign index (0 = Mesha/Aries) and Sign (western name)
This engine computes positions only. It makes no prediction and no recommendation about marriage, health, finance or timing, and the interpretive Kundli modules are outside its scope.
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
How do I calculate my birth star?
Computes sidereal (Vedic) longitudes, rashi, nakshatra with pada and the Vimshottari dasha balance from a birth date, time and place, with the ayanamsha named and its value shown. Open “How this is worked out” beside the result to see each step for your own figures.
What's the most accurate birth chart?
The birth star chart calculator follows the stated method, but the result is only as reliable as Ayanamsha convention, Explicit ayanamsha value, Date of birth, Time of birth (local) and Birth time is known and the assumptions shown. Check the working and sources before relying on it for an important decision.
How do I calculate my star chart?
It needs Ayanamsha convention, Explicit ayanamsha value, Date of birth, Time of birth (local), Birth time is known and UTC offset at the birthplace. Nothing else is required, and the figures stay in your browser.
What information do I need for the birth star chart calculator?
You need Ayanamsha convention, Explicit ayanamsha value, Date of birth, Time of birth (local), Birth time is known, UTC offset at the birthplace, Birth latitude and Birth longitude. The page opens with default figures that give moon rashi (Janma Rashi) of Kumbha, so you can see the scale before entering your own.
What does this birth star chart calculator show?
It shows Sidereal longitude, Sign index (0 = Mesha/Aries), Sign (western name), Rashi, Degrees into the sign, Ayanamsha applied, Ayanamsha convention and Nakshatra, with the working and any warnings for your entries.
Can I check how the birth star 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.