It is an astrological blend that occurs if Mars (Mangal) is in the 1st, 2nd, 4th, 7th, 8th, or 12th house of the Vedic astrology Ascendant chart. A person born in the presence of this state is termed a manglik. This state is astrologically believed to be inauspicious for marriages, causing uneasiness and tension in relationship, leading to total disharmony among the couples and sooner or later to other bigger problems. This is accredited to the "fiery" nature of Mars, the planet of war.
Also, if two mangliks marry, the negative effects are believed to dissolve each other out. There is also a belief that the negative consequences for a single-manglik marriage can be resolved if the manglik first performs a ceremony called a kumbh vivah, in which the manglik "marries" a banana tree, a peepal tree, or a silver or gold idol of the Hindu God Vishnu. (Source: Google)
How scientific is the chovva dosham (Mars bad-omen) that is believed by most of the Hindus? If it is something scientific it should be there for all humans irrespective of the various religions that people belong to but it is only a dhosham that is only for Hindus. Then it is mere a religious belief rather a superstition that is being reinforced. Astrology and Vasthu are said to be science and they work beyond the religious boundaries and it is pure science based on mathematics but that is not the case with chovva dosham.
I being a Christian I don’t understand how this horoscope works apparently and elicit bad effects in human beings, is it a fact or a fable? Or this Mars effect is there on everyone and only Hindus are tend to follow it? But even the marriages that do not come in the ambit of chovva dosham could also be inauspicious, causing uneasiness and tension in relationship, leading to harsh disharmony among the couples thus, leading to separation. Therefore, chovva dosham is not all about the troubled marriages.
The chovva dosham is calculated with the time of birth of the child. The criterion used to calculate the dosham is all the birth time but this raises too many questions such as when women largely depend on caesarian for giving birth against natural delivery the birth time could be easily advanced or delayed depending on the so called chovva dosham time duration. Birth could be forced to take place when it is wanted.
Another question for great dispute is that when a child is really born; the child (life) is born when the fusion of ovum and sperm takes place and child coming out of the mother’s womb is birth, is not just a mere a coming out? But for a certain scholastic school of Hinduism the real birth of a child happens when the child starts taking its first breath by its own.
All time is good and is there anything like a particular time is good or other time is bad. What could be the politics of the propagators of chovva dosham? A boy having chovva dosham should marry only a girl of the same dosham not necessarily they both should belong to same caste or sub-caste otherwise bad omen would befall on the family. Attributing the dosham to a highly rich girl of an upper cast a poor boy with same dosham could tie the knot thus, the boy could easily move up to the higher caste or sub-caste in the society and vice versa. Thus, attributing this kind of dosham could be to have an easy upward movement in the society and to reach the pinnacle without any effort. There would be sub-inter caste wedding also happening.
The difference between class and caste system should be noted here. In the class system anyone can easily move up in the class system with one’s own effort whereas in the caste system it does not happen. If one is born in the particular caste how much ever effort one puts in he remains in the same caste itself. Chovva dosham would break the caste barriers and help people attributed with the particular dosham to move to higher caste.
An increasing number of individuals are placing less emphasis on Manglik dosha, during the selection of a life partner. Nevertheless, there is still a pretty large following of people who give credence to Manglik Dosha.
(A friend of mine with this particular dosham is the inspiration for me to write it and discussion with him on the same helped me a lot)