Classical texts like Brihat Parashara Hora Shastra and Jataka Tattva state that if the native's birth time is correct, the positions of the Sun, Moon, and Lagna should have a specific mathematical relationship with the Pranapada. If they do not, the birth certificate is wrong.
A robust Pranapada Lagna Calculator must handle: (a) input validation, (b) sunrise computation, (c) respiration count based on real breath rate (optional: user-adjustable), (d) modular arithmetic for 360°, and (e) conversion to zodiac sign, degree, minute. pranapada lagna calculator work