Rasi Athipathi Porutham is calculated by identifying the ruling planets (Athipathi) of the zodiac signs of the bride and groom. Each of the twelve Rasi is governed by a specific planet such as the Sun, Moon, Mars, Mercury, Jupiter, Venus, or Saturn. Astrology then considers the natural relationship between these planetary rulers. If the planets are friendly or neutral toward each other, the porutham is considered favorable. When the planetary relationship is conflicting, astrologers usually review the horoscope in more detail before making a final conclusion.