Upapada Lagna (UL) , also known as , is a significant point in Jaimini astrology used primarily to understand the nature of one's spouse, the longevity of marriage, and the family background of the partner. It is technically the Arudha of the 12th house

The Upapada Lagna (UL) is a unique lens in Vedic astrology, specifically from the Jaimini system, used to understand the true nature of your marriage and life partner. While your standard 7th house shows the intent of marriage, the Upapada Lagna reveals the physical reality and sustainability of the bond. The Story of the "Second Lagna"

The UL and the house immediately following it (the 2nd from UL) reveal different aspects of your marital life: Upapada Lagna: Insights into Marriage and Spouse

11. Conclusion

This paper gives a clear, implementable Upapada Lagna calculation using the widely accepted addition method for intra-sign degrees and the sign offset formula u_sign = (7 + n) mod 12 with n = signs from Lagna to Moon. Implementers should document chosen conventions and offer variant options to accommodate differing traditional authorities.