Jaimini System of Astrology (pp. 45–52). Ranjan Publications, New Delhi.
Unlike your Sun sign or Moon sign, Upapada Lagna is not a planet or a fixed degree. It is a mathematical point calculated via a specific rule involving the 12th lord and its placement. A single error in counting signs yields a completely wrong interpretation. Hence, a dedicated ensures 100% accuracy. Upapada Lagna Calculator