How this match is computed, and the reading it speaks in

The three choices, as this page makes them

The acceptance floor18 of 36

Eighteen is the most-quoted floor and it is the one used here, with bands at 18 acceptable, 25 good, 32 excellent. Twenty-one is a common stricter reading, and plenty of practitioners will not read the number at all without the rest of the chart — which, given that the eight tables look at two facts per chart, is a defensible position rather than a fussy one.

Nadi pariharasnone applied

Three exceptions are commonly cited as cancelling Nadi dosha: the same nadi excused when the Moon rashis differ, the same nakshatra with different padas, and nakshatra lords who are mutual friends. Each cancels it in some traditions and in none of the others, so switching one on would make this page speak in one named lineage rather than in the general system. All three stay off. All three are wired and tested in the engine, and where the strict reading costs a particular pair its eight points, the result names which exception would have applied — and says in the same breath that it has not been applied.

Mangal doshabeside the score, never inside it

Classical Ashta Kuta does not contain it; the eight tables sum to thirty-six without it. Some practitioners treat an unmatched dosha as a veto over any score whatever, others as one factor among many. Folding it into the thirty-six would make it invisible, so it is computed, reported beside the total, and the total is left alone. It is counted in houses 1, 2, 4, 7, 8 and 12 from the ascendant, the Moon and Venus — and every part of that is a convention too: the second house is a Southern addition, and checking from the Moon and Venus as well as the ascendant is standard in some lineages and absent in others.

The reason for all three is one sentence: a matcher that flatters is worth nothing. Every relaxation above exists in the literature and every one of them is available as a documented parameter to whoever wants to argue with the default. None of them is applied silently, which is the only property of this list that matters.

The astronomy underneath

Siddhantadrik

Positions are the observed ones, computed from orbital series rather than from the mean motions of a classical siddhanta. The two disagree by degrees, not arcminutes, which is enough to move a nakshatra.

AyanamsaLahiri (Chitrapaksha)

The sidereal zodiac is fixed by the Lahiri ayanamsa, the Indian government standard, defined at 23°15′ on 21 March 1956. Every rashi and every nakshatra on these pages is sidereal.

The time zoneresolved at the birth instant

Not a fixed number per city. India ran on +06:30 through the war years of 1943 to 1945, and Calcutta on +05:21:10 before Indian Standard Time arrived in 1906; Britain ran double summer time; half the world's daylight-saving rules have moved at least once inside a living person's lifetime. An hour of error moves the ascendant a whole sign. The offset actually used is printed under each birth record on the result, so it can be checked against a birth certificate rather than assumed.

An unknown birth timemeasured, not assumed

The chart is cast at noon — never midnight, which is a real clock reading somebody could have been born at and therefore a lie that looks like data — and the page then measures how far the Moon actually travelled on that specific date. If it stayed inside one nakshatra all day, the score is unaffected and the page says so. If it crossed, the score shown is one of at least two possible scores and the page says that, above the total rather than below it. The ascendant is a separate and total loss, so the Mangal reference counted from the ascendant is dropped rather than guessed.

What is not computed here

Dashas, the seventh house and its lord, Venus, Navamsa strength, and every other thing a practising astrologer would look at before saying anything about two people. This page computes Ashta Kuta and Mangal dosha, both of which read a handful of facts, and it does not dress the result up as more than that. It also computes no remedy, recommends no gemstone, offers no consultation and carries no advertisement.

The tables are as set out in the Muhurta Chintamani of Daivajna Ram, reproduced in B. V. Raman's Muhurtha, with the Vashya groups from the Narapatijayacharya. Two grids — Vashya and Yoni — have reproductions that disagree in a few cells, which is stated on the eight kutas rather than buried.

Where the computation happens

In this browser. There is no server holding a table of answers, which is why the page works with the network off once it has been opened, and why neither birth record leaves the device. Nothing is stored either: no account, no cookie, no query string, no share link. Both charts exist for as long as the tab does.