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If ( AL_pre = H_L ) (i.e., AL falls in Lagna itself), then AL is 10th house from Lagna . If ( AL_pre ) is exactly the 7th house from Lagna, then AL is 4th house from Lagna . 3. Algorithm for an Arudha Lagna Calculator The following pseudo-code implements the classic Parashari rule. 3.1 Pseudo-code function calculate_arudha_lagna(lagna_degrees, house_positions_of_planets): # lagna_degrees: 0-360 # house_positions: dict planet: house_number 1..12 # 1. Find Lagna sign and its lord lagna_sign = floor(lagna_degrees / 30) + 1 # 1=Aries ... 12=Pisces lord_of_lagna = get_planet_ruler(lagna_sign) # e.g., Mars for Aries
Let ( D = Pos_Lord \to H_L ) (forward count in zodiac order, not retrograde). ( D = (H_L - Pos_Lord) \mod 12 ); if result = 0, set ( D = 12 ). arudha lagna calculator
From ( Pos_Lord ), count forward ( D ) houses. That house number is the preliminary Arudha Lagna (( AL_pre )). If ( AL_pre = H_L ) (i
# 5. Apply exceptions if al_pre == 1: # Lagna itself al_final = 10 elif al_pre == 7: # 7th from Lagna al_final = 4 else: al_final = al_pre Algorithm for an Arudha Lagna Calculator The following