Arudha Lagna Calculator Link -

# 2. Position of lord lord_house = house_positions[lord_of_lagna]

Author: Generative AI (Academic Compilation) Date: April 14, 2026 Subject: Jyotish (Vedic Astrology) – Padakrama Sahita Abstract Arudha Lagna (AL), also known as the Pada Lagna , is a crucial yet often misunderstood concept in Parashari Vedic astrology. Unlike the natal Lagna (Ascendant), which represents the physical self, Arudha Lagna signifies the image , illusion , or worldly perception of the self—how the world sees the native. This paper presents a formal algorithm for an Arudha Lagna calculator, detailing step-by-step computation rules, edge cases (e.g., 7th house exceptions), and interpretive frameworks. We provide pseudo-code, verification examples, and a discussion of common errors in software implementation. 1. Introduction In classical Jyotish, the Bhavat Bhavam principle teaches that houses derive meaning from their relationship to other houses. Arudha (literally "mounted" or "vehicle") takes this further: it is the reflection of a house’s owner or signification onto another house. Specifically, Arudha Lagna is the reflection of the Ascendant (Lagna) itself.

Let ( LordPos ) = house of Lagna lord (1..12). Let ( LagnaHouse = 1 ). ( D = ((1 - LordPos) \mod 12) ); if ( D == 0 ), ( D = 12 ). ( AL_pre = ((LordPos - 1 + D) \mod 12) + 1 ). If ( AL_pre == 1 ): ( AL = 10 ). Else if ( AL_pre == 7 ): ( AL = 4 ). Else ( AL = AL_pre ). End of paper. This paper can be used as both a theoretical introduction and a developer’s specification for building an accurate Arudha Lagna calculator. arudha lagna calculator

# 4. Preliminary AL al_pre = (lord_house + delta - 1) mod 12 + 1

# 3. Directional distance from lord to Lagna house (always forward in zodiac) delta = (1 - lord_house) mod 12 if delta == 0: delta = 12 This paper presents a formal algorithm for an

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 ).

# 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 if result = 0

From ( Pos_Lord ), count forward ( D ) houses. That house number is the preliminary Arudha Lagna (( AL_pre )).