Guna Milan
The matching of horoscopes is known as Guna Milan or Guna Milap  .According to Vedic Astrology,to assess the compatibility of two  individuals, their horoscopes need to be matched. 
Horoscope Matching or Guna Milan is deeply rooted in Hindu society.  It is the primary step before entering into a marriage relationship. An  accomplished astrologer is usually consulted to study the matchmaking  horoscopes of the boy and girl in question. This is an important step  and crucial to make certain a pleasant, fair and strong married  relationship. 
Guna Milan for match-making is done by referring to ‘Melapak Chart’  given in the Panchang (the Indian Almanac). This chart is considered on  the basis of eight factors. These factors are known as 'Kuta'. The  matching of these factors is known as Ashtakuta Guna Milap or 36 point  match. Out of these thirty six factors,a minimum of eighteen should be  matching to ensure compatibility.
 The following factors are considered in order to access the  prosperity in the married life of the couple :
Varna: It refers to the level of divine development  of both male and female. Out of thirty-six points, it contributes one  point. If both of them fall in the same Varna then it is considered very  auspicious. It refers that the spiritual development is of the same  kind. Both will have a close emotional link which is very significant in  the formation of a new relationship. At times, both will rouse each  other’s energies towards positive work. There will be a mutual  assistance in common activities. It is during this mutual assistance  that the emotional bondage would be felt. Additionally,family affairs  may be well taken care of by both of them. Varna is of much importance.  When it matches, it brings out the best in emotional and psychological  response between the two. 
Vasya: It suggests the degree of attractive control  and amenability the wife or husband would be able to work out on the  other. This is estimated as per the Moon sign system in Vedic Astrology.  It measures dominance compatibility. It is allotted two points, out of  the thirty six points. It would be best if both their Moon signs are  gracious to each other. This is a very good amalgamation for general  reciprocated compatibility. Both of them will have many similar values  and hence tend to be friends. Both of them will hold up each other’s  imaginative self-expression.
Tara: It is for destiny compatibility and holds  three points. Tara suggests the degree of auspiciousness and in-  auspiciousness of the girl and boy for each other. It indicates  interests and the aptitude to resolve problems through clear thinking  and communication . If the Tara matches they can help each other to  achieve goals and objectives by inspiring each other and sharing  practical information. 
Yoni: Yoni contributes four points out of the thirty  six points. Yoni means sex and this aspect implies sexual  compatibility. It plays a key role in laying down the groundwork for  marital happiness. It is conducive for emotional compatibility. If the  Yoni matches, both of them will enjoy each other’s company in romantic  relationship, games, sports and travel. They will have well-matched  taste with respect to culture, art forms and social beliefs, regarding  romance and sexual mores.
Grah Maitri: Grah Maitri gives a contribution of  five points out of thirty-six points. It accesses the normal behavior,  unpredictable compatibility and matching of views and interests of both  male and female with each other. It is calculated on the basis of the  Lord of the sign in which the Moon is situated. Here the religious,  social and ethical values of running a family and maintaining a worthy  home life are assessed.
Gana: Gana gives a contribution of six points out of  the thirty-six points. It has a bearing on the nature and character of  the couple concerned. On the basis of the Moon Nakshatra, the person is  categorized in three Ganas. These are:
- Dev (Divine)
 
- Manushya (Human)
 
- Rakshasha (Diabolical)
 It is said if there is disparity in Gana, there will be quarrels and  dissonance in relationships over financial management, inheritance and  alimony settlements. There could be a possibility of dishonest or  insincere association.    
 Nadi: Nadi provides eight points out of thirty-six  points in total. It is considered the most important amongst the aspects  considered. It is believed that the pair having the same Nadi will have  to endure hardship due to their child. Either there may be some  offspring related problems or the girl or the boy will not able to  sustain in childbirth.
It takes a deeper look at the  compatibility between the two – mental, religious, corporeal and  sub-conscious . The Nadi inconsistency between two people is also called  Nadi Dosha and generally regarded as a firm reason for denial of a  marriage.
 There are three different Nadis. These are:
 - Adi (start)
 
- Madhya (middle)
 
- Antya (end)
 These three represent Prakriti (nature) of an individual that is his/her  body constitution. As per Ayurveda there are three different Prakritis.  These are:        
 Bhakoot: Bhakoot or Bhukta contributes seven points out of thirty-six  points. It accesses whether the pair will have the ability to achieve  physical condition, accord, contentment, prolonged existence and  prosperity, in order to live a happy life together . It is determined by  comparing the arrangement of one's Moon Sign from the other's Moon  Sign. If the combination is not harmonious, the couple may be dishonest  and deceitful towards each other. At the same time, this may not be good  for progeny either. There may be a danger of a miscarriage or premature  demise of the child.            
Note that while Guna Milan is an integral part of matchmaking, but it  is not the only thing that should be considered. Longevity, Health,  Wealth, Children and overlapping Vimshottari Dashas are some additional  considerations that should be looked at.
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