In determining marriage compatibility, position of radical Mars in the horoscopes of the couple is given significant importance in certain parts of India. Placement of Mars is seen first before judging horoscopes for any Kuta or even its inherent strength & virtues. Sacerdotal fire is said to get extinguished, if he is un matchingly placed in horoscopes of the couple.
A girl or boy having Mars posited in 1,4,7,8, or 12th houses of radix does not yield benefic results after marriage. One spouse destroys the other. (Jyotir Vidyabharanam)
A girl having Mars in 1,4,7,8, or 12th houses destroys her husband; & a boy having similarly placed Mars destroys his wife after marriage. (Muhurta Sangraha Darpanam)
If Mars is in 2, 4,7, 8 or 12th houses in horoscope of female, death of her husband will happen, & similar situation in the horoscope of the husband will cause death of his wife (Kerala Shastra)
The latter view is accepted in South India where Mars in 2nd house is considered as cause of death of spouse instead of when posited in 1st as generally followed in the North India. Logic of including 2nd house in the consideration is that this house represents matrimonial aspects It is also accepted that the Mangal Dosha or Kuja Dosha is to be reckoned not only from the radical ascendant, but also from radical Moon & also from the radical Venus, as the Moon represents mind & Venus the sexual relations. It is also held that the Dosha is weak when present with respect to the radical ascendant, a little stronger from the radical Moon's position: & strongest when present from the radical Venus.
Extending this logic some opine that Kuja Dosha should also be seen from Jupiter who is significator (Karak) of 2nd house. But in the above three quoted dictums no such reference has been specifically made. It appears to be a derived phenomenon, as horoscope is judged from radical ascendant, radical Moon sign taken as ascendant & position of Karak (significator) taken as ascendant.
According to Muhurta Deepika, if either boy or girl is having the Sun, Mars, Saturn, Rahu or Ketu in 1,2,4,7,8 or 12 houses in their matal charts, they have Mangal Dosha. And, if only boy is having the said planets in these houses from the placement of Venus, he has the Dosha This Dosha gets cancelled if present in horoscopes of both bride & bridegroom. As poison kills poison, it is opined that if death of a spouse is indicated in a horoscope, then he / she should marry a person whose horoscope indicates the same. Or the Mars, causer of the affiction, should be weak or ineffective or having beneficial disposition, in which case the Dosha does not exist will not be effective. But this logic is not accepted by some, as a weak malefic causes more adversities than a strong malefic. Matching is felt essential if Mars is strong, or with a malefic, or aspected by a malefic, or is in a malefic sign or in a malefic navamsha or in a malefic asterism. According to Muhurta Deepika, count the number of afflictions (Doshas) present in both the horoscopes due to placements of the Sun, Mars, Rahu & Ketu. If the numbers of afflictions in the boy's horoscope are more or equal than that of the number present in the girl's horoscope, the union is recommended. (The more the afflictions , more the dosha and thereby more the adversity)
Some of the antidotes of the Mangal Dosha are as following :
1) if Mars is set or retrograde or debilitated or in enemy's sign (in 1,4,7,8.or 12th houses) then Mars Dosha is not effective (Muhurta Deepika) that means the person can marry another person who has no Kuja Dosha
2) If both the spouses are having Mangal Dosha or the total Gunas in matching are adequate (more than 27) then matching is recommended.
3) The Dosha is nullified if 2nd house is having the Moon & Venus, or Jupiter aspects Mars; or Rahu conjoins Mars (Muhurta Deepika)
4) If Graha Maitri is present & Gana is the same, & adequate Gunas (more than 27) are present then, the Dosha does not exist (Muhurta Deepika).
5) If any malefic (the Sun, Mars, Saturn, Rahu or Ketu) is present in either of 1,4,7,8,12 houses in horoscope of a spouse; and in horoscope of the other spouse any malefic is placed in similar house-
then the Dosha does not exists (Phalita Navaratana Sangraha).
6) There is no Mars Dosha if Mars is in Aries coinciding 1" house; Scorpio coinciding 4" house: Capricorn coinciding 10 house; Cancer coinciding house; or Sagittarius coinciding 12 house (Muhurta Deepika)
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7) In the opinion of some, Mars in 2nd house coinciding with Gemini or Virgo, 4th house coinciding with Aries & Scorpio, 7th house coinciding with Cancer or Capricorn, 8th house coinciding with Sagittarius or Pisces, 12th house coinciding with Taurus or Libra - produces no Mangal Dosha
8) Strong Jupiter & Venus in ascendant or 7h house counteract the Dosha. Some opine that if Jupiter or the Moon joins Mars, then the Dosha does not exist,
9) If a spouse is having Saturn in 1st or 4th or 7th or 8th or 12th then the Mangal Dosha does not exist (Muhurta Sangraha Darpanam & Muhurta Deepika)
10) if the Moon and Venus are in 2nd house or Mars is aspected by Jupiter or Rahu is in quadrant, then Mangal Dosha does not prevail.
11) If Mars is in Leo or Aquarius ( in any of the said houses) then the Kuja Dosha is not present at all
12) Mars does not cause Mangal Dosha to natives having Leo or Cancer as radical ascendant, as Mars is Yogakaraka (special benefic) planet for these ascendants. But if Mars signifies malefic effects in such chart (being debilitated, combust, in enemy's sign etc.) then, he shall cause the Dosha