Nadi Dosha
Both partners' Moon nakshatras in the same Nadi (Adi, Madhya or Antya), which scores 0 of 8 in Guna Milan.
How this site calculates it
Both Moons in nakshatras of the same Nadi; the common exceptions (same nakshatra with different pada, same sign with different nakshatra, same nakshatra with different sign) are reported.
Rule in the code: src/domain/jyotish/milan.ts — Nadi koota
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Related terms
Traditions may vary by region and Panchang convention. Times are shown for the selected place, time zone and calculation profile.