How the score is calculated
Eight factors. A base total out of 36.
From the recorded local birth time, the calculator uses the selected city’s IANA time zone, including historical daylight-saving rules, to find UTC. Astronomy Engine calculates the geocentric Moon position; a Lahiri mean ayanamsa anchored to J2000 converts it to the sidereal zodiac. Nakshatra and pada are then calculated. The existing-kundali shortcut uses the supplied star and pada. It then applies the following rules. Bride and groom roles follow the traditional directional tables; reversing them can change some points. No caste or personal worth is inferred.
| Factor | Max | Calculation |
|---|---|---|
| Varna | 1 | Traditional Moon-sign groups. |
| Vashya | 2 | Five Moon-sign groups; Sagittarius and Capricorn split at 15°. |
| Tara | 3 | Inclusive star counts both ways, reduced by nine; remainders 3, 5 and 7 receive no points for that direction. |
| Yoni | 4 | Traditional 14-animal relationship table. |
| Graha Maitri | 5 | Natural friendship between the Moon-sign lords. |
| Gana | 6 | Directional table of three traditional star groups. |
| Bhakoot | 7 | Zero for 2/12, 5/9 or 6/8 sign relationships; seven otherwise. |
| Nadi | 8 | Zero for the same traditional group; eight for different groups. |
References & scope
Traditional tables vary between publications. This implementation uses a declared base-score method and does not add exception or cancellation points. You can inspect the calculation source directly.
- Prokerala — published matching example (PDF, new tab)
- AstrologyAPI — published matching example (PDF, new tab)
- Astronomy Engine — MIT
- GeoNames — CC BY 4.0
- Swiss Ephemeris documentation — Lahiri / IAE reference
- View this calculator’s rules (JavaScript, new tab)
Birth-date calculations support 1900 onward and use a geocentric Moon, not a full kundali. If the calculated Moon is within 3 arcminutes of a pada or Vashya boundary, this tool asks for a confirmed chart instead of giving an uncertain score. References describe an astrological tradition; they do not validate predictive claims scientifically.