Kerala matching, and where it parts from Tamil practice

Kerala and Tamil practice run the same ten tests and disagree about the settings underneath them, which is why the same two charts can pass in Thrissur and fail in Thanjavur. A Malayali family and a Tamil family will both tell you they match by the ten poruthams. They will name the same ten, in the same order, using mostly the same Sanskrit. Seen from Delhi or Mumbai this looks like one southern system with two accents.

It is closer to two examiners working from one syllabus and two mark schemes. The tests are shared. The pass marks are not, the handling of a borderline result is not, and at least two words denote different things depending on which side of the Western Ghats you are standing on.

What follows is a walk through the specific parameters. Not because parameters are interesting in themselves, but because a named threshold is something you can ask an astrologer about and get a short factual answer to. “Is Kerala stricter?” has no such answer.

Do the two traditions actually run the same ten tests?

Yes, and that shared list is the reason the disagreements are so hard to spot. Dina, Gana, Mahendra, Stree Deergha, Yoni, Rasi, Rasyadhipathy, Vasya, Rajju and Vedha appear on both sides. A Kerala report and a Tamil report will show ten rows with the same headings, which is precisely why a family reads two different verdicts as an accuracy problem.

The framework is also shared in a deeper way: both traditions grade instead of totalling. A porutham comes back uttamam, madhyamam or adhamam — best, middling, worst — and the ten are read as a set with two of them able to stop the reading outright. Neither tradition sums them into a mark out of thirty-six the way the northern Ashtakoota does. That structural point is covered on the page that takes the ten one at a time, and this page assumes it instead of repeating it.

Where they part is one level down, in the numbers and tables each test consults. Those are not visible on a printed report. They are visible in the panchanga the astrologer works from, and in the software he uses, and almost nowhere else. G.H. Visweswara demonstrated how far that can travel by running the same couples through eight Kannada panchangas side by side and finding they did not agree. The same exercise across the Kerala–Tamil border produces the same shape of result.

Before the details, one consequence of that shared list. Because the headings match, a family comparing two southern reports naturally reads a difference as an accuracy problem, and accuracy problems have culprits. A difference in a threshold has no culprit. It has a source, usually a printed one, and the source can be named. That is the whole reason this page is organised parameter by parameter and not tradition by tradition: a parameter points at a book, and a characterisation points at a person.

Where does the Stree Deergha pass mark sit?

Everyone counts the same way and at least five different pass marks have been published for the result. Stree Deergha counts forward from the bride’s birth star to the groom’s, inclusive of both ends, around a circle of twenty-seven. Ashwini to Bharani is two. Ashwini to Revati is twenty-seven. Nobody disputes any of that.

Then the thresholds. B.V. Raman writes in Muhurtha that the groom’s star should preferably lie beyond the ninth, and records in the same breath that some authorities say seven. The VSKP panchanga, which is the Kerala reading we implement, takes the seven. The Tamil figure printed most often takes thirteen. Astro-Vision reserves “excellent” for beyond eighteen, and an OP note gives fourteen for one community. Five numbers, one count.

Work it through with the couple in our published sample. Priya was born under Ashwini, the first star; Arjun under Purva Bhadrapada, the twenty-fifth. Count inclusive and you get twenty-five, which clears every threshold anyone has printed. Now change one detail and give the groom Pushya, the eighth star. The count becomes eight. That passes the Kerala line of more than seven, by one. It fails Raman’s more than nine and it fails the Tamil more than thirteen. One nakshatra moved and a porutham went from cleared to refused, without any planet, birth time or ayanamsa changing.

Underneath the pass mark the two traditions also grade differently, and the grading boundaries do not line up with the thresholds. The scale attributed to the OP panchanga puts everything up to eight in the lowest grade; the VSKP scale used in Kerala puts the lowest grade at six and under. A count of eight is therefore adhamam under one printed scale and madhyamam under the other. Neither number is wrong. They are two lineages that wrote down two lines.

Six published positions on one number, and a report that prints only the verdict has thrown away the one piece of information that would let you check it.

Neither friends nor enemies

Kerala counts a neutral pair of Moon-sign lords as a pass; the stricter southern reading counts the same pair as a failure, on identical charts. Rasyadhipathy compares the lords of the two Moon signs; Raman calls it the most important kuta of the set. Friendly lords pass. Enemy lords fail. The interesting cell is the one in between, where the two planets are neutral to each other, or where one calls the other a friend and gets neutrality back.

That cell is not rare, and the two southern positions on it are usually labelled Opinion 1 and Opinion 2 in the literature. Opinion 1, the Kerala reading, treats it as sufficient. Opinion 2, the reading that follows Raman, requires actual friendship. Nothing else in the computation moves: same Moon signs, same lords, same relationship table, opposite verdicts on one of the ten.

This is the cleanest example on the page of what a bare verdict costs you. A report that prints “Rasyadhipathy — not favourable” is not telling you whether the lords are enemies or merely not friends. The first is a finding both traditions agree on. The second is a finding one tradition would have passed. Our porutham tool prints the lord on each side and the relation in each direction, so that the disputed cell is visible as a disputed cell instead of resolved silently.

Does the word Rajju mean the same thing on both sides?

No, and this is the single most reliable source of confusion between the two traditions. In Tamil practice Rajju is the ninth porutham: the twenty-seven stars are sorted into five groups named for parts of the body, and a couple in the same group is refused. It is a blocking condition, not a deduction, and it has no counterpart in the northern thirty-six-point system at all, which is the subject of the page on Rajju’s absence from the northern eight and not this one.

In Kerala the same word is routinely used for the Nadi koota: the three nadi groups, the ones the Ashtakoota weights most heavily of the eight. Kerala practice adds a refinement Tamil practice does not carry: only Madhyama nadi on both sides is treated as gravely adverse. We ran every possible pairing of the star positions to see how much traffic the word carries: across all 11,664 ordered pairings, computed over the whole population rather than a sample, 33.3% share a nadi.

So “Rajju dosha” from a Kerala astrologer and “Rajju” from a Tamil one may be reports about two unrelated tests, on two different groupings, of two different sizes. The two findings carry different consequences and different cancellation rules, so nothing about severity can be settled until you know which of the two is on the table.

Five groups, or three? Ask that first.

Two vedha tables, one missing partner

In Raman’s list, which the Kerala reading follows here, Chitra has no vedha partner at all: a Chitra bride simply cannot fail this test. Tamil practice as printed by ePanchang makes Chitra, Mrigashira and Dhanishta mutually vedha, a three-way clique that Raman’s table does not contain. So a Chitra bride matched to a Dhanishta groom fails vedha in one tradition and is untouchable by vedha in the other.

That is a difference of table content, not of interpretation. Vedha pairs certain nakshatras as mutually obstructive; if the bride’s star and the groom’s star are partners, the porutham fails, and most of the list is stable across sources. Chitra is the exception, and it is the kind of exception that no amount of careful reading resolves, because the two traditions are not reading one table differently. They hold two tables.

This one can be argued in both directions, honestly. A table that leaves one of twenty-seven stars with no partner looks like something dropped in transmission, which is an argument for the Tamil three-clique. But inventing a partner to tidy a table is exactly how corrupt data enters a tradition and stays there, which is an argument for leaving Raman’s list alone. We ship both and label which is running, because choosing one silently would be making the decision on the reader’s behalf and then hiding it.

How does each tradition weigh malefic burden?

Both traditions count malefic burden on both charts and ask whether the two are comparable, and Kerala carries a heavier model of that count than Tamil practice does. The question is comparative rather than absolute: not whether either chart is afflicted, but whether the two are afflicted to a similar degree. Nothing in the ten poruthams asks it, which is why the test travels beside them and not inside them.

The version most southern software ships is the equal-point count — five malefics, six houses, three reference points, one point per hit, everything weighted alike. The classical Kerala model, Dosha Samyam as Desabhatla sets it out, weights all of it instead: heavier houses against lighter ones, Mars against Rahu, the dignity of the placement, and the three reference points against each other. The two can therefore return opposite readings from identical positions, and Ketu is the sharpest instance — a full malefic in one model and nothing at all in the other. The unit-by-unit arithmetic of both, and the direction the comparison runs, are set out in the papasamyam explainer.

What separates the two traditions is not that arithmetic but which arithmetic arrives. Tamil practice generally runs the equal-point count as one more line beside the ten poruthams, reported as a pair of totals and a verdict. Kerala practice keeps the older weighted model in circulation, and keeps above it a second test the papa count is not a substitute for: dosha samyam proper, the house-by-house comparison the Kerala sources rate the higher of the two. Almost no software computes that one, so a Kerala refusal can rest on a test that no printed papa total speaks to.

The consequence for a family holding two southern reports is direct. “Papasamyam does not balance” from Thrissur and the same sentence from Thanjavur are frequently not the same finding, and neither report says which model produced it. Ask that before anyone argues about severity. It is also the one difference on this page a family can act on immediately, because both models take the same two charts and can simply be run again: the counts are integers, the sources are printed, and the second answer takes minutes, not a second consultation.

What does the Kerala reading change inside the thirty-six-point table?

Two settings, and neither of them appears on a printed report. Where the Kerala reading runs the eight-koota table alongside the poruthams, it inherits most of the southern configuration — the mutual vashya requirement, Raman’s directional Rasi kuta, the tara count taken from the girl to the boy only and scored all or nothing. On those it agrees with the Raman southern reading exactly.

It differs on varna. The standard rule passes when the groom’s varna is equal to or higher than the bride’s; the OP and VSKP panchangas require it to be strictly higher, so an equal-varna couple that scores the point everywhere else scores nothing here. It is one point out of thirty-six, which sounds negligible until you are the couple sitting on seventeen.

It also differs on yoni. The Kerala reading caps the yoni score at two when the groom’s star is a female one and the bride’s a male one. That is a penalty no classical text states numerically; it reaches us second-hand, through a source who says in as many words that the terminology was not clear to him. We implement it because the Kerala preset is the Kerala preset, and we flag it low-confidence in the output instead of presenting it with the same authority as a verse. Full marks on yoni are uncommon regardless, at just 7.3% of all pairings, so the cap bites less often than it reads.

How far apart do the two Dasa Sandhi windows sit?

Six months, twelve months or eighteen, depending on whose published threshold is applied to identical dates. Dasa Sandhi asks whether the two people change Vimshottari planetary periods at close to the same time. Both traditions compute the timelines identically, from the Moon’s nakshatra at birth, by a scheme nobody disputes.

The Tamil figure most often cited is six months. The Kerala figure is twelve. Some Tamil astrologers work at eighteen, which is three times the first. A couple whose changeovers fall nine months apart is clear under one published threshold and flagged under another, with no disagreement anywhere about the dates themselves.

There is an exemption riding alongside, and it has its own dispute. Those born under the maha-nakshatras — Magha, Mrigashira, Swati and Anuradha — are held by some sources to be outside Dasa Sandhi consideration entirely. The VSKP panchanga rejects that exemption. So a Swati bride can be exempt or not exempt from a test whose threshold is itself unsettled, which is two layers of disagreement stacked on one finding. If Dasa Sandhi is the reason your match was refused, ask about both layers.

The agreements are larger than the differences

They agree on more than they differ on, and none of the differences tells you anything about two people. Both judge Mars from the southern house set, which omits the first house because the Manasagari verse omits it, and both judge it from the Moon and Venus as well as the ascendant. Both use the same yoni animal table. Both read the poruthams as a set rather than a total. The Dina, Gana and Mahendra tests are effectively unanimous across every southern source we implement.

Even where they agree on the house set, they can disagree on how severe the finding is. The Raman southern reading grades a Mars affliction by which house it sits in and what keeps it company; the Kerala reading grades it by the Moon sign, running full severity for four signs and none at all for two. Same finding, different adjective attached to it — and the adjective is what a family actually hears.

Now the limits, flatly. Our base rates are computed over the space of nakshatra positions, not over a cohort of real Indian births, so they describe how often two traditions can differ, not the rate in any one community. The Kerala yoni penalty rests on a second-hand report. The Tamil vedha clique rests on one panchanga. And across all pairings run under five documented traditions at the conventional acceptance line, 56.4% of enumerated pairings trigger a tested difference or veto across the combined census checks. This does not isolate Kerala-versus-Tamil disagreement or establish which method is right. That question does not have a computational answer, and a page that pretended otherwise would be inventing an authority the traditions never established.

One more limit, less obvious. Comparing thresholds tells you where two traditions differ on paper. It does not tell you how any individual astrologer weighs a borderline result in a room with two families in it. The anthropological work on how matching is used in practice — Fuller and Narasimhan’s fieldwork in a Tamil Brahman community is the closest study to this subject — finds considerable discretion in that room. Parameters bound the conversation. They do not conduct it.

What should you ask a southern astrologer?

Four questions, each with a short factual answer, and none of them a challenge to anyone’s judgement. That last part matters more than it should. A family that opens by disputing competence gets a shorter conversation than a family that opens by asking which threshold was used.

• Which porutham failed, by name. Ten rows, one or more of them adverse. This is the question that converts a verdict into something examinable.
• If Stree Deergha: what was the count, and what pass mark was applied? The count is a number between one and twenty-seven and is not in dispute. The pass mark is a choice among five published ones.
• If Rajju: five body-part groups or three nadi groups? One question that resolves the most common cross-border misunderstanding in southern matching.
• If Papasamyam: equal-point or weighted? The two models disagree structurally, and which of them a report ran is almost never printed on it.

Each answer is the same fact whichever tradition your two families follow, which is what makes them useful in a household where both are represented. If the two families are not merely from different districts but from different systems altogether — a southern reading on one side and the northern thirty-six on the other — that is a larger problem than a threshold, and it has the page on matching across two systems. For a match refused on a thirty-six-point total instead of on a porutham, the northern eight are taken one at a time in the koota-by-koota walk, and across every pairing, 66.7% clear the conventional line without anyone selecting for compatibility at all.