Sun-Moon interchanges important in chart comparisons for relationship:The Moon represents the general social and emotional capacity for good relationships.It represents in man's chart his capacity to relate to women. This should be examined for long term and general marital and domestic happiness. The Sun similarly represents the woman's general capacity to relate to
men. A weak or afflicted Sun may not give her openness to male energy necessary for a happy relationship. A woman with a weak Sun will often choose weak men as partners, as will a man with a weak Moon.
A Venus-Mars interchange signifies strong sexual drive in relationships. It is often not conductive to marital happiness because it causes us to seek additional fulfillment outside of marriage.
As Moon represents our feelings, our social and personal side, it is important in all relationships. Moons of both partners should have good relationships, such as in trines from each other. Moons in opposite signs are usually favorable. The planets ruling the Moons in both charts should be friendly to each other.
High compatibility is above 25 points. Good compatibility is usually above 20 points. Average is 18 points.
Traditional Kuta system measures primary the compatibility between Moons and Nakshatras. It shows emotional affinity and the ability to function together as a family. Prominence of such evaluation is based on traditional Hindu values of marriage. However a good Moon relationship is not enough for a successful relationship, without consideration of placement of Jupiter and Venus between the charts. Relationship of Mars-Venus should also be considered for western couples. It is best to use computative method together with comparative method, - it will help to avoid superficial judgments. If points are low but the charts are otherwise in harmony, then it may be sufficient for a good relationship. If points are low, that can be counteracted (unless total points are below 10). If points are high but charts are not in harmony, then it will not be enough for a good relationship. We should examine Kuta system, as it is a quick to note, and then go into comparative analysis for more clear decision on the matter.
Benefics in Kendra houses will bestow the worldly benefits and achievements. Benefics in Trines gives benefits on material and spiritual levels. Location in ninth house gives favors from outer sources, like parent, gurus, institutions and government. Location in fifth indicates beneficial collection of samskaras (as a cause of karma) and good intelligence. Generally planets in angular houses are stronger then in trine positions.
Here they guard the health of the person and are a source of strength, vitality, motivation and give the capacity to do hard work and make great achievements. However if there is more then one malefic in sixth of eleventh houses, or there is malefic under malefic aspect, then it can cause health problems and harm other aspects of native's life (in case of eleventh house).
Raja Yoga is produced by any combination of trine lords (1, 5, 9) and angle lords (1, 4, 7, 10). The best trine lord is ninth, then followed by fifth and first The tenth is the strongest among Kendra lords followed by fourth, first and seventh. Raja Yoga which involves sevens lord is very weak and should be considered only if stronger combinations exist in chart. Some astrologers don't consider aspects between trine and angle lords as Raja Yoga. Raja Yoga formed by one planet was discussed earlier.
The tenth divisional chart (Dashamsha) is much like tenth house in meaning. It shows native's karmic impact upon world at large. It is important source of information about vocation, career and achievements. It should be examined along with tenth house and it's lord in Rashi, Sun, Mercury, Jupiter and other factors for career.