A wedding ceremony is a time of joy and revealing as the family members and friends of both the boy and the girl who get tied up in wedlock, join hands to rejoice at the great occasion. All the same, it must not be forgotten that marriage is a serious and a solemn occasion, a tying of the knot for their lifetime. Marriage is never to be disregarded as a temporary coming together of a boy and a girl. It is a solemn decision to last for the rest of their lives and divorce is never to be considered.
It does not go without mentioning that a Hindu marriage is solemnized only after the decision taken for it with the aid of the poruthams. To make the right and sure decision on a particular marriage, the elders of the families of the girl and the boy, without omitting their respective parents, meet in a quiet and a peaceful environment where they can study the issues regarding the marriage of the girl and the boy.
Poruthams are based on the zodiac signs of the boy and the girl who wish to get married. The 27 birth stars or nakshatras of each individual have their astral influence throughout the life of that person through the nine planets or the grahas. These together comprise the zodiac sign of the person. The grahas in consideration are Mars, Venus, Mercury, Jupiter, Saturn, Sun, Moon, Rahu and Ketu.
The study of the zodiac signs of the individuals desiring marriage were studied and categorized into poruthams or kootas by the ancient sages of India. This they did because they wanted the best outcome of a marriage which they too regarded as a lifelong union of a man and his wife.
There were twenty poruthams which were chartered to begin with but now only ten are used everywhere. The ten poruthams are dinam, ganam, yoni, rasi, rasiyathipaty, rajju, vedha, vasya, mahendram and stree deergam.
Out of the ten poruthams, vasya porutham denotes compatibility between the zodiac signs of the couple that is to get married. Therefore, if there is agreement between their kootas, this enables mutual love and affection to be enhanced and to continue between the man and the wife. Strong physical attraction mutually between the husband and his wife is expected to exist together with mutual love, respect and cooperation. Vasya porutham gains more prominence when there is absence of other poruthams like ganam porutham and the rasi porutham. The zodiac signs which agree to each other are Taurus (Vrishabha) with Cancer (Kataka) and Libra (Tula), Aries (Mesha) with Scorpio (Vrischika) and Leo (Simha), Cancer (Katak) with Scorpio (Vrischika) and Sagittarius (Dhanus), Gemini (Mithuna) with Virgo (Kanya), Leo (Simha) with Libra (Tula), Libra (Tula) with Capricorn (Makara), Virgo (Kanya) with Gemini (Mithuna) and Pisces (Meen), Sagittarius (Dhanus) with Pisces (Meena), Scorpio (Vrischika) with Cancer (Kataka) and Virgo (Kanya), Aquarius (Kumbha) with Aries (Mesha), Pisces (Meena) with Capricorn (Makara) and Capricorn (Makara) with Aquarius (Kumbha) and Aries (Mesha).
If the boy and the girl are in love and wish to get married, in such cases the use of poruthams is exempted from making a decision for their marriage. This applies also to those who get married late in life.