குண்டலி மிலனில் நாடி தோஷம்: மிக முக்கியமான பொருத்த தோஷ விளக்கம்

Classical Definition: Three Nadi Types, 27 Nakshatras, and BPHS Authority

Nadi Dosha is the most heavily weighted compatibility factor in the Ashtakoot Milan (8-factor compatibility system) used in Vedic Kundali matching, carrying 8 out of 36 total points — the highest single weight in the entire system. The dosha arises when both prospective partners belong to the same Nadi type, as determined by their natal Janma Nakshatra (birth star). The three Nadi types are: Adi Nadi (associated with Vata/Wind constitution), Madhya Nadi (associated with Pitta/Fire), and Antya Nadi (associated with Kapha/Water). The authoritative textual basis is Brihat Parashara Hora Shastra, Chapter 32, verses 14–15 (Santhanam translation), which prescribes the Nadi assignment for all 27 Nakshatras in a canonical palindromic pattern — Adi-Madhya-Antya-Antya-Madhya-Adi — repeating every six Nakshatras. This is critical: the pattern is NOT a simple sequential cycling (Adi-Madhya-Antya-Adi-Madhya-Antya) as popularly misrepresented in many software tools, but a palindromic mirror that reverses at the midpoint of each six-Nakshatra group. The tradition understands Nadi as indicating Prakriti (constitutional type) derived from the Panchabhutas at birth; identical Nadis in both partners signal potential genetic, health, and constitutional incompatibility, especially affecting the Apatya (children). When same Nadi + same Nakshatra occurs, a specific cancellation applies as noted in classical texts.