A person can be considered Manglik if Mars is placed in his horoscope in the First House - Lagna - Ascendant or Fourth House or Seventh House or Eighth House or Twelfth House. Mangal Dosha OR Manglik Dosha and why it is significant while Match-Making. Mangal dosha is one of the major deciding factors in Hindu marriage system. Find the Mangal Dosha in a person's birth Kundali or Horoscope as per Indian Vedic Astrology. Ask Astrologer http://astrologyhoroscopeindia.com/mangal-dosha-report/p22