Two systems, same purpose
Before a Tamil wedding, compatibility is assessed using 10 poruthams. Before a North Indian wedding, Gun Milan with 36 points is used. Both systems attempt the same thing: determining whether two horoscopes' nakshatras are compatible for marriage. They share the same stellar foundation, the 27 nakshatras, but they weight the dimensions and report the result differently.
The porutham system gives a binary answer per dimension: the couple matches or does not match on that particular trait. Gun Milan assigns points (gunas) across 8 dimensions, and the result is a cumulative score out of 36. Neither system is more correct than the other, they represent two regional traditions that have evolved over centuries.
Gun Milan / Ashtakoota explained
Ashtakoota (ashta = eight, koota = group) is the North Indian system for horoscope matching. It evaluates eight dimensions, and each dimension contributes a specific number of points (gunas) to the total score:
| Koota | Points | What it measures |
|---|---|---|
| Varna | 1 | Spiritual development level |
| Vashya | 2 | Mutual attraction and dominance |
| Tara | 3 | Birth star compatibility |
| Yoni | 4 | Physical and sexual compatibility |
| Graha Maitri | 5 | Planetary friendship (lords of the rashis) |
| Gana | 6 | Temperament (Deva, Manushya, Rakshasa) |
| Bhakoot | 7 | Rashi compatibility (relationship between signs) |
| Nadi | 8 | Constitution and health, the critical dimension |
What counts as a good match in Gun Milan?
- Below 18 points: generally not recommended.
- 18–23 points: acceptable, but with reservations.
- 24–29 points: good match.
- 30–36 points: excellent match.
Comparison: porutham vs Gun Milan dimension by dimension
Several dimensions in the two systems measure the same concept under a different name. The table below pairs them up:
| Porutham (South) | Gun Milan (North) | Points | Similar? |
|---|---|---|---|
| Dina | Tara | 3 | Yes, same concept for birth star distance |
| Gana | Gana | 6 | Identical concept, temperament (Deva, Manushya, Rakshasa) |
| Yoni | Yoni | 4 | Same animal symbols, same idea |
| Rasi | Bhakoot | 7 | Similar, the rashi relationship between the couple |
| Rasi Adhipathi | Graha Maitri | 5 | Similar, friendship between the rashis' planetary lords |
| Vasya | Vashya | 2 | Similar, mutual attraction and influence |
| Rajju | Nadi | 8 | Both critical, but calculated differently |
| Vedhai | No direct counterpart in Gun Milan | ||
| Mahendra | No direct counterpart in Gun Milan | ||
| Stree Deergha | No direct counterpart in Gun Milan | ||
| Varna | 1 | No direct counterpart in porutham |
The key differences
Binary vs. points-based
Porutham gives a yes/no answer per dimension: Dina porutham matches, or it does not. Gun Milan gives a graded result: you might score 2 out of 3 possible points in Tara koota. This means Gun Milan's total score allows for nuance, a couple can compensate for weakness in one dimension with strength in another. In the porutham system, each dimension is evaluated on its own, and certain mismatches (especially Rajju) can be decisive regardless of the other results.
10 dimensions vs. 8
Porutham has 10 checks. Gun Milan has 8. The three poruthams without a counterpart, Vedhai (harmful combination), Mahendra (prosperity and progeny), and Stree Deergha (longevity of the marriage via nakshatra distance), reflect South Indian priorities that are not codified in the Ashtakoota system. Conversely, Gun Milan's Varna koota (spiritual level via varna order) has no counterpart in porutham.
Rajju vs. Nadi, the two deal-breakers
Rajju (South Indian) divides nakshatras into groups along a body metaphor (feet, hips, navel, neck, head) and warns against pairings within the same group. Nadi (North Indian) divides nakshatras into three constitution types (Aadi, Madhya, Antya) and warns against two identical types. Both are deal-breakers in their respective systems, but they use different groupings and have different exception rules.
Exceptions and remedies
Both traditions have exceptions that can override a negative result. In the porutham system, certain nakshatra combinations are exempt from Rajju dosha. In the Gun Milan system, Nadi dosha can be overridden if specific conditions are met (e.g. if the couple shares a nakshatra but has different padas). The exceptions are tradition-bound and vary from family to family and from astrologer to astrologer.
Which system should you follow?
Follow your family's tradition. The systems are regional, not competing: Tamil families use the 10 poruthams, North Indian families use Gun Milan. Neither is more correct than the other, they are two organically evolved approaches to the same fundamental concern.
For inter-regional marriages (one Tamil and one North Indian family), it may be appropriate to have both systems checked. This is common practice, and an experienced astrologer can interpret both results in context.