Strength vs Nature of Planets « Janma Kundali, Free Astrology Software According to the ancient texts, the nature of the planet is divided into benefic and malefic. Benefic planets (Saumya grahas) are Moon, Mercury, Jupiter and Venus. These indicate favourable, positive and beneficial behaviours. On the other hand, Malefic planets (Kroora grahas) are Sun, Mars, Saturn, Rahu and Ketu.