Chara Karakas, Atmakaraka/Karakamsha, Arudha padas, Upapada and Argala.
Jaimini's chara karakas are variable significators, assigned by ranking the seven classical grahas, Sun through Saturn, by their degree within their own sign, highest first. The highest is the Atmakaraka, the significator of the self; then in order Amatyakaraka, Bhratrikaraka, Matrikaraka, Putrakaraka and Gnatikaraka; and the lowest degree is the Darakaraka, the significator of the spouse. This page prints the full ranking with each graha's degree so the ordering can be checked.
Only the fraction of the sign counts, never which sign it is, so a graha at 28 degrees of Pisces outranks one at 27 degrees of Aries. This app uses the seven-karaka scheme of the Jaimini Sutras, the one K.N. Rao's school follows. An eight-karaka variant that admits Rahu also exists, and it shifts every rank below wherever Rahu lands, so a reading taken elsewhere may not agree with this one. The page also shows the Karakamsha, the navamsa sign of the Atmakaraka.
An arudha pada is computed, not observed. Find the lord of a house, count from the house to the sign that lord occupies, then count that same number of signs on again from the lord; the sign you land on is that house's arudha. Brihat Parashara Hora Shastra 29.4 to 5 then displaces a result that lands on the house itself or on the seventh from it, and its two clauses state one rule: take the tenth sign from wherever the pada landed.
Counted from the house that is the tenth in the first case and the fourth in the second, not the tenth in both. Jaimini's own Upadesha Sutras and the Uttara Kalamrita apply no displacement at all, so the two schools can place a pada six signs apart on the same chart; the full kundli result's Jaimini tab prints both signs wherever they part.
All twelve are computed, A1 through A12. A1, the arudha of the ascendant, travels under three names across two schools: Jaimini's own Upadesha Sutras call it the Pada Lagna and BPHS 29.1 to 3 calls it the Lagna Pada, and the app resolves each name against its own school's count rather than treating them as freely interchangeable. A7 is the Darapada, A10 the Rajapada, and A12 is the Upapada, which Jaimini practice treats as the primary marriage indicator.
Jaimini aspects are cast by signs rather than by grahas, and they follow modality. A movable sign aspects all the fixed signs except the one adjacent to it; a fixed sign aspects all the movable signs except the one adjacent to it; and the dual signs aspect one another. Every graha standing in a sign casts that sign's aspect, so the aspect is a property of the sign and its occupants inherit it.
This is a different system from Parashari graha drishti, in which every graha aspects the seventh from itself and Mars, Jupiter and Saturn carry additional special aspects of their own. The two do not reduce to each other, they frequently disagree about whether one point sees another, and this page does not mix them.
Argala is intervention on a sign. The primary argalas come from the 2nd, the 4th and the 11th from the reference point; the 5th and the 9th give a trikona argala only when the intervening graha is a benefic or exalted. Each argala has one specific obstruction, the virodha argala, that answers it: the 12th answers the 2nd, the 10th answers the 4th, the 3rd answers the 11th and the 9th answers the 5th.
Whether an obstruction actually holds is settled by count, on Jaimini sutra 1-1-8, na nyuna vibalasca: the virodha obstructs when its bodies are not fewer than the argala's, so a smaller count leaves the argala standing. More than two malefics in the 3rd produce an argala that cannot be obstructed at all.
When the reference point is Ketu the reckoning reverses and the argala and virodha houses swap. The page reckons argala both from a sign and from each graha's own occupied sign, which are two different frames for the same counting.
Three tabs carry the output - chara karakas, arudha padas and argala - beneath a summary card giving the Atmakaraka with its degree and the Karakamsha sign. The rasi dashas that also belong to the Jaimini system, the Narayana dasha among them, are computed by this app but are rendered in the full kundli result's Dasha and Jaimini tabs rather than on this page.
Karaka meanings are given as the names the tradition assigns, Atmakaraka for the self and Darakaraka for the spouse and so on, and not as predictions about a life. Where a Jaimini reading has a locus this app can cite, it carries that citation on the surface that renders it; where it does not, the page prints the computation and stops there. Nothing in the three tabs is scored, ranked or totalled.